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Wimberley, Jack Timpson. "Behavior of Periodic Coupled Microstrip Resonators". Thesis, Boston College, 2011. http://hdl.handle.net/2345/1983.
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Thesis advisor: Krzysztof KempaThe resonant modes of a sequence of periodically spaced microstrip resonators is studied. The system is analyzed as transmission line with periodic capacitive gaps, as a waveguide with apertures via normal mode expansion, and through a derivation of the static fields in the gap between two microstrip resonators via conformal mapping. FDTD simulations are also performed to numerically calculate the resonant modes of the sequence and also its absorption spectrum when it contains a lossy dielectric. It is found, as expected, that when the gap size is large, the microstrip resonators are uncoupled and there resonant modes are unperturbed. As the gap size narrows, the resonators become strongly coupled, and changing boundary conditions perturb the resonant modes upwards in frequency. Moreover, an additional resonant mode is observed that does not correspond to any uncoupled mode
Thesis (BS) — Boston College, 2011
Submitted to: Boston College. College of Arts and Sciences
Discipline: College Honors Program
Discipline: Physics Honors Program
Discipline: Physics
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Sze, Kin Yip. "Analysis of line-source-fed single-layer microstrip reflectarrays". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ62669.pdf.
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Jin, Won Tae. "Circuit models for a millimeter-wave suspended-microstrip line discontinuity". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA240906.
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Thesis (M.S. in Systems Engineering (Electronic Warfare))--Naval Postgraduate School, September 1990.Thesis Advisor(s): Atwater, Harry A. Second Reader: Janaswamy, Rama. "September 1990." Description based on title screen as viewed on December 29, 2009. DTIC Identifier(s): Suspended striplines, microstrip lines, equivalent circuits, program listings, theses. Author(s) subject terms: Suspended-microstrip line, step discontinuity, equivalent circuit model, step-change. Includes bibliographical references (p. 60). Also available in print.
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Rodríguez, Cepeda Juan Pablo. "Modelatge multimodal de transicions i asimetries en línies three-line-microstrip". Doctoral thesis, Universitat Ramon Llull, 2010. http://hdl.handle.net/10803/9142.
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Una línia de transmissió three-line-microstrip consisteix en tres pistes paral·leles practicades sobre la cara d'un dielèctric amb un pla de massa inferior. La propagació en aquesta línia es pot descriure en termes de tres modes fonamentals anomenats ee, oo i oe. Tot i que aquests modes són ortogonals interaccionen entre sí a qualsevol transició, discontinuïtat o asimetria. En el pla d'una transició o asimetria es genera un intercanvi d'energia o conversió modal en el que prenen part tots els modes.En aquest treball s'analitza la conversió modal que s'origina en un conjunt de transicions i asimetries construïdes sobre línies three-line-microstrip. L'estudi es realitza aplicant la tècnica de l'anàlisi multimodal. L'ús d'aquesta tècnica permet la deducció d'una sèrie de models multimodals (un per a cada transició) que proporcionen una anàlisi simple, rigorosa i quantitativa d'aquest fenomen.
La validesa d'aquest estudi es verifica de manera experimental. Els bons resultats obtinguts demostren que els models multimodals proposats prediuen de manera precisa el comportament de les transicions. Aquest fet permet el seu ús per analitzar circuits o estructures constituïts per trams de tres pistes acoblades. En el cas d'aquesta tesi, han estat aplicats als camps de l'EMC i de les microones. Pel que fa a l'EMC, s'ha realitzat un estudi de l'acoblament i la integritat del senyal en configuracions de PCB amb trams de tres pistes acoblades. Aquest estudi ha permès identificar les transicions i asimetries en aquests circuits com a possibles fonts d'interferència i de degradació dels senyals ja que la conversió modal es pot interpretar com a un procés d'interferència que involucra tots els senyals presents. Pel que fa a les microones, s'ha realitzat una anàlisi multimodal de filtres spurline. Aquesta anàlisi ha permès desenvolupar dues noves estructures, la principal característica de les quals és la seva compacitat que, a diferència d'altres estructures similars, s'aconsegueix permetent la presència d'un nou mode en el procés de ressonància. L'ús dels models multimodals per a l'anàlisi d'aquestes estructures ha permès una interpretació clara i senzilla del seu funcionament així com el desenvolupament d'una sèrie de regles de disseny que permeten un ajust fàcil i ràpid de certs paràmetres dels filtres com ara la freqüència central i l'ample de banda.
Una línea de transmisión three-line-microstrip consiste en tres pistas paralelas practicadas sobre la cara de un dieléctrico con un plano de masa inferior. La propagación en esta línea se puede describir en términos de tres modos fundamentales llamados ee, oo i oe. Aunque estos modos son ortogonales interaccionan entre se en cualquier transición, discontinuidad o asimetría. En el plano de una transición o asimetría se genera un intercambio de energía o conversión modal en el que toman parte todos los modos.
En este trabajo se analiza la conversión modal que se origina en un conjunto de transiciones i asimetrías construidas sobre líneas three-line-microstrip. El estudio se realiza aplicando la técnica del análisis multimodal. El uso de esta técnica permite la deducción de una serie de modelos multimodales (un per a cada transición) que proporcionan un análisis simple, riguroso i cuantitativo de este fenómeno.
La validez de este estudio se verifica de manera experimental. Los buenos resultados obtenidos demuestran que los modelos multimodales propuestos predicen de manera precisa el comportamiento de las transiciones. Este hecho permite su uso para analizar circuitos o estructuras constituidos por tramos de tres pistas acopladas. En esta tesis doctoral, han sido aplicados a los campos de la EMC i de las microondas. En el primero de ellos, se ha realizado un estudio del acoplamiento y la integridad de la señal en configuraciones de PCB con tramos de tres pistas acopladas. Este estudio ha permitido identificar las transiciones y asimetrías en estos circuitos como posibles fuentes de interferencia y de degradación de las señales ya que la conversión modal se puede interpretar como a un proceso de interferencia que involucra todas las señales presentes. En el campo de las microondas, se ha realizado un análisis multimodal de filtros spurline. Este análisis ha permitido desarrollar dos nuevas estructuras, cuya principal característica es su compacidad que, a diferencia de otras estructuras similares, se consigue permitiendo la presencia de un nuevo modo en el proceso de resonancia. El uso de los modelos multimodales para el análisis de estas estructuras ha permitido una interpretación clara i sencilla del su funcionamiento así como el desarrollo de una serie de reglas de diseño que permiten un ajuste fácil i rápido de ciertos parámetros de los filtros como por ejemplo la frecuencia central y el ancho de banda.
A three-line-microstrip transmission line consists of three parallel coupled strips printed on a grounded dielectric substrate. The propagation in this line can be described in terms of three fundamental modes, namely the ee, oo and oe modes. These modes are orthogonal and propagate independently unless a transition or asymmetry is present in the line. Any transition or asymmetry will generate an energy exchange or modal interaction among all the propagating modes.
In this work, the modal interaction of a set of transitions and asymmetries in three-line-microstrip transmission lines is analyzed. The study is carried out by using the multimodal analysis. By means of this technique a set of multimodal circuit models (one for each transition) is derived. These models provide a simple and a quantitative interpretation of the modal interaction.
The proposed multimodal analysis is experimentally validated. The obtained results show that the derived multimodal models accurately predict the behavior of the transitions. Due to this fact, they can be used for the analysis of circuits and structures composed of three-coupled-strip sections. In this work, the models have been applied to both the EMC and microwave fields. In the former, they have been employed to study the cross-talk and signal-integrity problems in PCB configurations involving tree-coupled-trace sections. The performed analysis has shown that transitions and asymmetries in these circuits must be considered as a source of interference and signal degradation since the modal interaction can be interpreted as an interference process that involves all the present signals. In the latter, a multimodal analysis of spurline filters has been performed. This study has allowed the derivation of two new filter structures whose main feature is their compactness, which, in contrast to other analogous filters, is achieved by allowing the presence of an additional mode in the resonance process. The use of the multimodal models for the analysis of these structures has permitted both a simple interpretation of the filter operation and the derivation of a set of design rules which allows a rapid fine tuning of some filter parameters such as the center frequency and the bandwidth.
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Choi, Man Soo. "Computer-aided design models for millimeter-wave suspended-substrate microstrip line". Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA227259.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 1990.Thesis Advisor(s): Atwater, H.A. Second Reader: Lee, H. M. "March 1990." Description based on signature page as viewed on August 26, 2009. DTIC Descriptor(s): Strip Transmission Lines, Computer Aided Design, Computerized Simulation, Parameters, Microwave Equipment, Radar, Full Wave Rectifiers, Transmittance, Resonant Frequency, Construction, Wave Propagation, Coefficients, Boundary Value Problems, Resonators, Circuits, Discontinuities, Ka Band, Models, Scattering, Equivalent Circuits, Frequency. Author(s) subject terms: Millimeter wave, suspended substrate, design model. Includes bibliographical references (p. 78-79). Also available online.
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Imran, Md Asheque. "Dual-Band Quarter Wavelength and Half Wavelength Microstrip Transmission Line Design". Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801931/.
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The thesis represents the design for dual-band quarter wavelength and half wavelength microstrip transmission line. Chapter 2 proposed the design of a novel dual-band asymmetric pi-shaped short-circuited quarter wavelength microstrip transmission line working at frequencies 1GHz and 1.55 GHz for 50Ω transmission line and at frequencies 1GHz and 1.43GHz for 60Ω transmission line. Chapter 3 proposed the design of a novel dual-band quarter wavelength microstrip transmission line with asymmetrically allocated open stubs and short-circuited stubs working at frequencies 1GHz and 1.32GHz. Chapter 4 proposed the design of dual-band pi-shaped open stub half wavelength microstrip transmission line working at frequencies 1GHz and 2.07GHz. Numerical simulations are performed both in HyperLynx 3D EM and in circuit simulator ADS for all of the proposed designs to measure the return loss (S11) and insertion loss (S12) in dB and phase response for S12 in degree.
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Tugulea, Alexandru. "Two-dimensional equations for the analysis of microstrip line dispersion and step discontinuities". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0012/NQ53051.pdf.
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Uzelac, Lawrence Stevan. "A Multiple Coupled Microstrip Transmission Line Model for High-Speed VLSI Interconnect Simulation". PDXScholar, 1991. https://pdxscholar.library.pdx.edu/open_access_etds/4526.
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A model is presented which incorporates the advantages of a mixed mode simulation to characterize transmission line behavior in multiple coupled Transmission line systems. The model is intended for use by digital circuit designers who wish to be able to obtain accurate transmission line behavior for complex digital systems for which continuous time simulation tools such as SPICE would time prohibitive. The model uses a transverse electromagnetic wave approximation to obtain solutions to the basic transmission line equations. A modal analysis technique is used to solve for the attenuation and propagation constants for the transmission lines. Modal analysis done in the frequency domain after a Fast Fourier Transform of the time-domain input signals. Boundary conditions are obtained from the Thevinized transmission line input equivalent circuit and the transmission line output load impedance. The model uses a unique solution queue system that allows n-line coupled transmission lines to be solved without resorting to large order matrix methods or the need to diagonals larger matrices using linear transformations. This solution queue system is based on the method of solution superposition. As a result, the CPU time required for the model is primarily a function of the number of transitions and not the number of lines modeled. Incorporation of the model into event driven circuit simulators such as Network C is discussed. It will be shown that the solution queue methods used in this model make it ideally suited for incorporation into a event-driven simulation network. The model presented in this thesis can be scaled to incorporate direct electromagnetic coupling between first, second, or third lines adjacent to the line transitioning. It is shown that modeling strictly adjacent line coupling is adequate for typical digital technologies. It is shown that the model accurately reproduces the transmission line behavior of systems modeled by previous authors. Example transitions on a 8-line system are reviewed. Finally, future model improvements are discussed.
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Kemppinen, E. (Esa). "Determination of the permittivity of some dielectrics in the microwave and millimetre wave region". Doctoral thesis, University of Oulu, 1999. http://urn.fi/urn:isbn:9514251954.
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Abstract
In the first part of this study, determination of the dielectric properties of the low loss microwave ceramic material, barium nonatitanate (Ba2Ti9O20), around 1 GHz is discussed. The structures under test were coaxial resonators, the cores of which were made of barium nonatitanate and the metallization was realised by thick film silver. The measured value of the real part of the relative dielectric constant was εr = 37 and that of the loss tangent was tan σ = 0.00014. The change of the resonance frequency of the coaxial resonators with temperature, in the range -20 … +80 C, was 4 ppm/ C. In addition, realisation of compact interdigital and comb-line bandpass filters was demonstrated for the 900 MHz mobile phone band. Besides Ba2Ti9O20, Ba(Sm,Nd)2Ti5O14 ceramic material with a dielectric constant of εr = 78 was also employed in order to improve the miniaturisation. The volume of the smallest filter was 2 cm3 and the weight was 9 g.
In the second part of this study, various measurement methods have been demonstrated to determine the real part of the relative permittivity of FR4 fibreglass circuit board. Test structures were straight asymmetric open-circuited strip lines. It was found that the real part of the relative permittivity decreased slightly with frequency. At 0.72 GHz and 4.5 GHz, εr values of 4.3 and 4.1, respectively, were measured. All the characterisation methods used gave consistent values for εr, and electromagnetic simulators were used to verify the results.
In the third part of this study, the structures under test were microstrip or strip line transmission lines, the S parameters of which were measured by using on-wafer measurement techniques. It was found that the insertion loss of the 10 mm long etched Cu microstrip was slightly less than that of the Ag microstrips which were manufactured by etching and gravure offset printing techniques, respectively. The performance of the Ag microstrips was, however, similar. In addition, a theoretical basis was established for the determination of εr of the dielectric substrate and the attenuation coefficient of the transmission lines under test. The calculations were based on signal flow diagrams. The method was applied to determine the dielectric and loss properties of a commercial, Kyocera, Japan, LTCC (Low Temperature Cofired Ceramic) material up to 50 GHz. The measured value of the real part of the relative permittivity was εr = 5.7, and the loss tangent was approximately tan σ = 0.003.
The essential idea behind the studies reported in this thesis was twofold. First, the studies aimed at characterising dielectric media which find usage in the realisation of UHF, microwave or millimetre wave circuits. Second, the studies aimed to obtain data of immediate value in practical design work. For this reason, the structures under test were transmission lines having extensive usage in practical high frequency circuit design.
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Chiang, Chun Pong. "Design of quasi-elliptic microstrip bandpass filter using terminated anti-parallel coupled-line structure". Thesis, University of Macau, 2007. http://umaclib3.umac.mo/record=b1937941.
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Pajares, Vega Francisco Javier. "Modelatge multimodal de transicions en entorn microstrip". Doctoral thesis, Universitat Ramon Llull, 2007. http://hdl.handle.net/10803/9134.
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Avui dia cada vegada s'ha de tenir més en compte com es realitza el traçat de pistes en les plaques de circuit imprès (PCB). Això és degut a que cada vegada més hi viatgen senyals amb components freqüencials més elevades. Per tant, paràmetres com la desadaptació per impedància característica, acoblaments, ressonàncies i comportaments complexes de les transicions que es troben els senyals en la seva propagació per les pistes, han de ser considerats per evitar problemes d'integritat del senyal i garantir la compatibilitat electromagnètica (EMC) amb el seu entorn. El present treball de tesi s'ha centrat en l'estudi del comportament d'una situació particular, però molt habitual, de pistes: dues pistes sobre un pla de massa, formant el que es coneix com una línia de transmissió microstrip acoblada. Els senyals que viatgen a través d'una línia microstrip acoblada es poden descompondre en dos modes bàsics de propagació: mode comú (on la tensió està definida entre el pla de massa i cada pista) i el mode diferencial (on la tensió està definida entre les pistes). Aquesta descomposició és molt habitual en el món de la compatibilitat electromagnètica ja que les tècniques de filtratge de les interferències varien depenent si aquestes viatgen en mode comú o en mode diferencial.
El treball desenvolupat s'ha focalitzat en l'estudi, des d'aquest punt de vista multimodal (que té en compte simultàniament tant el mode comú com el diferencial), de les diferents transicions que es pot trobar el senyal en la seva propagació degut al traçat de pistes. Com a resultat d'aquest estudi s'han obtingut uns models circuitals que permeten l'anàlisi i simulació dels diferents modes que intervenen i que han estat validats de forma experimental. Aquest fet ha permès l'ús d'aquests models en l'anàlisi de problemes d'integritat del senyal que són comuns en el entorn de la compatibilitat electromagnètica (EMC). Els resultats obtinguts han estat presentats en congressos nacionals i internacionals.
Hoy en día cada vez se debe tener más en cuenta como se realiza el trazado de pistas en las placas de circuito impreso (PCB). Esto es así debido a que cada vez más viajan por ellas señales con componentes frecuenciales más elevadas. Por lo tanto, parámetros como la desadaptación por impedancia característica, acoplamientos, resonancias y comportamientos complejos de las transiciones que se encuentran las señales mientras se propagan por las pistas, deben ser tenidos en consideración para evitar problemas de integridad de la señal y garantizar la compatibilidad electromagnética (EMC) con su entorno.
En el presente trabajo de tesis se ha centrado en el estudio del comportamiento de una situación particular, pero habitual, de pistas: dos pistas sobre un plano de masa, formando lo que se conoce como línea de transmisión microstrip acoplada. Las señales que viajan a través de una línea microstrip acoplada se pueden descomponer en dos modos básicos de propagación: modo común (donde la tensión está definida entre el plano de masa y cada pista) y modo diferencial (donde la tensión está definida entre pistas). Esta descomposición es muy habitual en el mundo de la compatibilidad electromagnética ya que las técnicas de filtrado de las interferencias varían dependiendo si estas viajan en modo común o en modo diferencial.
El trabajo desarrollado se ha focalizado en el estudio, desde este punto de vista multimodal (que tiene en cuenta simultáneamente tanto el modo común como el diferencial), de las diferentes transiciones que puede encontrarse la señal durante su propagación debido al trazado de pistas. Como resultado se han obtenido unos modelos circuitales que permiten el análisis y simulación de los diferentes modos que intervienen y que han sido validados de forma experimental. Este hecho ha permitido el uso de dichos modelos en el análisis de problemas de integridad de la señal que son comunes en el entorno de la compatibilidad electromagnética (EMC). Los resultados obtenidos han sido mostrados en congresos nacionales e internacionales.
Nowadays, the placement of the strips in a printed circuit board (PCB) has to be performed with increasing care, because of the rise of the spectral content of the signals propagating through the strips. Due to this fact, mismatches of the characteristic impedances, crosstalks, resonances and complex behavior of the transitions that the signals may encounter in their propagation have to be considered in order to avoid signal integrity problems and to guarantee the electromagnetic compatibility with their environment.
This work is focused on the study of the behavior of a particular, but also a very common way of routing strips: two close strips above a ground plane, forming a extit{coupled microstrip transmission line}. The signals present at this transmission line can be decomposed into two basic signals known as common mode (where its voltage is defined between the ground plane and each strip) and differential mode (where its voltage is defined between the two strips). This decomposition is often found in electromagnetic compatibility because the different techniques of filtering interferences depend on their main mode of propagation.
The study carried out in this thesis is focused on the analysis from a multimodal point of view of different transitions that signals encounter during their propagation in a coupled microstrip transmission line.
As a result of this analysis, a number of circuit models for different transitions have been obtained and experimentally validated. These models have been used to successfully study signal integrity problems found in EMC and they have been presented in national and international symposiums.
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Jones, Mark Loyd. "Spatial sampling of microwave frequency electrical signals using photoconductive switches on a microstrip transmission line". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/15619.
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Hong, Sio Ian. "The microstrip parallel coupled-line bandpass filter with simultaneous dual-band response and bandwidth enhancement". Thesis, University of Macau, 2009. http://umaclib3.umac.mo/record=b2119530.
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Shi, Ruirong. "Zeroth-Order Resonator (ZOR) Antenna Using Composite Right/Left-Handed (CRLH ) Microstrip Transmission Line (TL)". University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1301714086.
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KUMAWAT, HARISH CHANDRA. "DESIGN AND IMPLEMENTATION OF L BAND MICROSTRIP COUPLER WITH IMPROVED COUPLING AND HIGH DIRECTIVITY". Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14914.
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The couplers are passive devices used in the field of radio technology. They couple a defined amount of the electromagnetic power in a transmission line to a port enabling the signal to be used in another circuit. Directional couplers are most frequently constructed from two coupled transmission lines set close enough together such that energy passing through one is coupled to the other. In this thesis work, a new symmetrical coupled-line circuit structure without any patterned ground plane is proposed to design tight-coupling high-directivity couplers for L Band, which would be found in numerous applications in a microstrip RF front end because of its simple structure and inherent excellent compatibility. Based on a traditional even- and odd-mode technique, closed-form mathematical equations for both circuit electrical parameters and scattering parameters are obtained. Due to the use of two coupled-line sections placed in the vertical direction, the directivity of this novel coupler without any other compensation techniques can be enhanced while maintaining tight-coupling. This microstrip coupled-line coupler can be used for the designs of various balanced power amplifiers, mixers, modulators, measurement systems, circularly polarized antennas, beam-forming array antennas, etc. Advanced Design System (ADS) tool was used for design and simulation. The simulated results show good return loss, quadrature phase characteristics, high directivity, and strong coupling performances of the coupler.
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YEH, YEN-CHUN, i 葉彥均. "Microstrip isolation line analysis". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/51029236475861292763.
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碩士中華大學
電機工程學系
105
In this thesis, Wu provides a microstrip isolation structure for reducing crosstalk, comprising a microstrip line and two grounded resistors. The microstrip line comprises a subwavelength periodic corrugated structure in the edge. The two grounded resistors are coupled to two ends of the microstrip line, respectively. The plurality of indentation structures are periodically arranged in a subwavelength configuration that a period length of the plurality of indentation structures is far smaller than a wavelength of a transmission signal generated by a crosstalk around the microstrip line, whereby impingement of electromagnetic wave is isolated by the plurality of indentation structures. The equivalent circuits of subwavelength corrugated strip lines also study by finite element method. keywords: crosstalk, subwavelength, microstrip isolation
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Liu, Yung-Yuan, i 劉永元. "Microstrip Coupled-Line Bandpass Filters". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/15440286242427206378.
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碩士國立臺灣大學
電信工程學研究所
94
In this thesis, the parallel coupled lines are used to design the microstrip bandpass filters. The main objectives of this study are to improve the selectivity and to suppress the spurious responses of bandpass filters. By suitably introducting the cross-coupling path in the filter circuit, multiple transmission zeros may be generated to improve the filter selectivity. The filters based on quarter-wavelength coupled line have spurious passbands at odd-multiples of passband center frequency. In this study, the coupled-line sections are made shorter than quarter wavelength so that the spurious response may be suppressed. The next spurious passband then appears around five times the center frequency.
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林憶芳. "Microstrip-line-fed compact printed". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/38950141604280962713.
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CHUO, CHIH-HENG, i 卓志恆. "Analysis of Voided-Ground-Plate Microstrip Line". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/84689933720690737460.
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碩士中華大學
電機工程學系碩士班
89
In this thesis, the theory and technique for resolving the characteristic impedance and propagation constant of a voided-ground -plate microstrip line are discussed. The main task of this research considers a periodic 1-D pattern consisting of square voids etched on the ground plane of microstrip line. We proposed a simple, efficient and accurate method to rigorously analyze the periodic planar structures. This method uses the transmission (ABCD) matrix to cascade three simplified models such as microstrip line, coupled microstrip-slotline and the equivalent circuit for discontinuities. Three types of the voided- ground-plate microstrip line models have been simulated using HFSS. Several voided-ground-plate microstrip line circuits were fabricated with different periods or hole sizes to investigate the relations of the structural parameters to the characteristic impedance and propagation constant in a specified frequency band. The method in this thesis provides not only a clear physical picture to understanding the wave phenomena in such a transmission structure but also a simple and accurate design criterion for practical implementations of voided-ground-plate microstrip circuits.
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Wang, Bing-Hsiao, i 汪秉孝. "Broadband Slot Arrays Fed by Microstrip Line". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/15910676299809835340.
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碩士國立臺灣大學
電信工程學研究所
96
The broadband designs of half-wavelength slot array and quarter-wavelength slot array are proposed in this thesis. The slot elements are offset-fed by microstrip line to obtain the wider impedance bandwidth. Furthermore, the impedance bandwidth of the array antennas which composed of the slot elements can be wider. It can be kept stable that the radiation gain and the radiation pattern of the proposed half-wavelength slot array in the impedance band. Besides, it is formed a quasi-open circuit of the slotline by the truncated ground plane. The size of the slot element and the composed array can be compact, and the impedance bandwidth can be improved. Plane sheet is used as a reflector to make the slot array unidirectional radiation. The bandwidth of the proposed quarter-wavelength slot array is wider than the half-wavelength slot array. And it is also kept stable that the radiation gains and the radiation pattern. A plane sheet is used as a reflector which cancels the backed radiation and improves the radiation gain to make the slot array unidirectional radiation. The design details of the above slot array antennas are depth discussed in this thesis and are proved with the simulation and measurement results.
21
Liao, Jia-Hong, i 廖家宏. "Microstrip Bandstop Filter with Three-Line structure". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/47355126765606894834.
Pełny tekst źródłaStreszczenie:
碩士長庚大學
電子工程研究所
94
In the thesis, parallel coupled microstrip line connecting quarter-wavelength open-circuit stub is employed to establish a narrow band bandstop filter. To enhance the bandwidth control, three-line structure is also proposed and the design formulas and equivalent circuits are derived. The relationship between the circuit bandwidth and the stub is discussed and the design procedure is described. Several bandstop filters with maximally flat and Chebyshev responses are designed and fabricated to validate the proposed method. Good agreement between simulated and measured results is obtained.
22
Wang, Bing-Hsiao. "Broadband Slot Arrays Fed by Microstrip Line". 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2207200814425800.
Pełny tekst źródła
23
Hui, William W. G. "Low-cost microstrip line-based ferrite phase shifter". Thesis, 2006. http://hdl.handle.net/10125/20557.
Pełny tekst źródła
24
Huang, Kuan-Lin, i 黃冠霖. "The Improvement of Coaxial to Microstrip Line Transition". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/62251869378201527777.
Pełny tekst źródłaStreszczenie:
碩士長庚大學
電子工程研究所
94
This thesis mainly investigates and improves the transmission characteristics of coaxial-to-microstrip transitions. First, SMA connector-to-microstrip transitions are investigated. Though the operating frequency of SMA connector is only up to 18 GHz, by modifying the structure we will improve it from 18 GHz to 30 GHz. Second, the K connector-to-microstrip transitions are investigated. Because the operating frequency of K connector is up to 40 GHz, we will concentrate on the effects of many factors on the transmission characteristics such as the volume and the position of solder and the alignment of K connectors to microstrip lines. The structures of transition are first simulated by HFSS electromagnetic simulation software. Then, the improved SMA connectors are fabricated. Finally, microstrip lines and patch antennas are built on 25N and FR4 substrates for verification purpose. The measured results are compared to simulation results.
25
Liang, C. Y., i 梁繼元. "Microstrip line with periodic variation on its width". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/01934588660359225450.
Pełny tekst źródłaStreszczenie:
碩士國立交通大學
電信工程系
88
In this thesis, the single mode approximation is employed to investigate the guiding characteristics of the microstrip line with periodic variation. The structure under consideration contains two types: one is the width-modulated microstrip structure and the other is that of substrate-modulated one. The numerical results are displayed in the form of the Brillouin diagram with the phase and attenuation constants both. On the other hand, the scattering of guided-wave by the finite size periodic microstrip has also been carried out in this thesis. In addition, the passband and stopband behavior is verified by the measured data. Thus, the numerical results provide not only the clear physical picture for the phenomena involved in the periodic structure but also the design criterion for practical considerations.
26
LIOU, SHI-RONG, i 劉璽鎔. "Study of Extremely Compact Microstrip Branch-Line Couplers". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/99wem3.
Pełny tekst źródłaStreszczenie:
博士逢甲大學
電機與通訊工程博士學位學程
107
The conventional branch-line coupler is consisted of four quarter wavelength transmission lines. Coupler devices are used to divide power and generate phase difference in radio transceivers. Conventional 90° hybrid couplers are implemented in balanced amplifier or mixer circuit design. With advancement in technology, communication systems have rapidly evolved in recent years. Currently, all cost-reduction efforts, including size reduction and low-cost fabrication, are focused on the components of modern wireless communication systems. In the study, the novel compact coupler was designed with equal different structure and folding structure without any implementation of lumped elements, via-holes, and bonding wires. However, the use of unoccupied area of coupler interiors reveals overlap problems. The design equations of the equal difference structure and folding structure were derived, and a compact branch-line coupler was designed and assembled on FR4 substrate with a 900 MHz operating frequency. Additionally, the circuit area of the equal difference structure and folding structure couplers achieves a size reduction of 84.2% and 85.1% compared with that of a conventional coupler at the same operating frequency. The proposed coupler was successfully designed for easy integration with modern wireless communication systems.
27
BARTHWAL, AYUSHI. "DESIGN OF MICROSTRIP LINE COUPLER WITH IMPROVED DIRECTIVITY". Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14211.
Pełny tekst źródłaStreszczenie:
In this project, a symmetrical microstrip line directional coupler has been designed
using the synthesis technique. The introduced design procedure does not require the
prior knowledge of the physical geometry of the coupler and requires only the
information of the port impedances, coupling level, and operational frequency. The
width of coupled microstrip lines, spacing between them and length of the coupler is
then determined.
The directivity of the conventional coupler designed is improved by bringing
the changes in the physical geometry of the coupler by phase velocity compensation,
which utilizes the coupled microstrip with square wiggles on its inner edges.
In this project, a directional coupler has to be designed at the operational
frequency of 1.5GHz with the coupling of -15dB. The width, length and spacing of
coupled microstrip line are calculated with the help of Agilent ADS linecalc and
then S-parameters of this coupler are calculated. The layout is plotted down in the
layout window and is simulated. Then, the changes in the geometry of the coupler
are made in order to improve the isolation and thus the directivity. The change in
geometry raises the odd mode inductance more strongly than that of even mode and
this results in phase velocity compensation between even- and odd-modes.
The coupler is designed on Rogers-R03210 substrate with dielectric constant
of 10.2 and thickness of 0.5mm. The simulations are carried out with the help of
software Agilent Advanced Design System 2008.
28
BARTHWAL, AYUSHI. "DESIGN OF MICROSTRIP LINE COUPLER WITH IMPROVED DIRECTIVITY". Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14459.
Pełny tekst źródłaStreszczenie:
Abstract
In this project, a symmetrical microstrip line directional coupler has been designed
using the synthesis technique. The introduced design procedure does not require the
prior knowledge of the physical geometry of the coupler and requires only the
information of the port impedances, coupling level, and operational frequency. The
width of coupled microstrip lines, spacing between them and length of the coupler is
then determined.
The directivity of the conventional coupler designed is improved by bringing
the changes in the physical geometry of the coupler by phase velocity compensation,
which utilizes the coupled microstrip with square wiggles on its inner edges.
In this project, a directional coupler has to be designed at the operational
frequency of 1.5GHz with the coupling of -15dB. The width, length and spacing of
coupled microstrip line are calculated with the help of Agilent ADS linecalc and
then S-parameters of this coupler are calculated. The layout is plotted down in the
layout window and is simulated. Then, the changes in the geometry of the coupler
are made in order to improve the isolation and thus the directivity. The change in
geometry raises the odd mode inductance more strongly than that of even mode and
this results in phase velocity compensation between even- and odd-modes.
The coupler is designed on Rogers-R03210 substrate with dielectric constant
of 10.2 and thickness of 0.5mm. The simulations are carried out with the help of
software Agilent Advanced Design System 2008.
29
YI, CHIH-FU, i 易智富. "Propagation Behavior Analysis of Subwavelength Periodic Groove Microstrip Line". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/67026460297803173272.
Pełny tekst źródłaStreszczenie:
碩士中華大學
電機工程學系
105
A new type of differential microstrip lines on which the spoof surface plasmon polaritons (spoof SPPs) can propagate at low frequency band is developed. The differential microstrip line structure is designed by introducing open slit periodic subwavelength pattern on the edge of coupled traditional microstrip lines. Numerical and experimental analysis verify that such differential periodically structured microstrip lines support odd type of spoof surface plasmon polaritons(SPPs) at microwave frequencies. Compared with the traditional differential microstrip line, the spoof SPPs mode can be highly localized on the surface of the structured differential microstrip line, and so the crosstalk and common mode effect between differential structured microstrip line and single microstrip line is very low. We also analysis the equivalent circuit of subwavelength periodic structured microstrip lines using finite element method. The TDR measurement the impedance of microstrip lines verified numerical results. Therefore, this new kind of differential periodically structured microstrip line would be of great use in high density microwave circuits and high speed systems to improve signal integrity efficiency. Keyword: spoof surface plasmon polaritons (spoof SPPs) , differential microstrip ,equivalent circuit , crosstalk , common mode effect
30
Tzung-Ming, Lai. "60GHz Circularly Polarized Patch Antenna Fed By Microstrip-Line". 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1407200517285200.
Pełny tekst źródła
31
Jhong, Long-Sing, i 鍾隆興. "Microstrip-Line filters design using defected ground structure (DGS)". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/49098595794078969803.
Pełny tekst źródła
32
Chang, Po-Ying, i 張博奕. "Research of Microstrip Coupled-Line Bandpass Filter and Diplexer". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/43258530698022243721.
Pełny tekst źródłaStreszczenie:
碩士國立中央大學
電機工程研究所
95
In this study, several kinds of microstrip coupled-line structures are used to implement compact bandpass filters, which are based on quarter-wavelength resonators. Compared to the conventional parallel-coupled bandpass filters that are based on half-wavelength resonators, the circuit size of proposed filters are reduced by more than half. The passband of proposed coupled-line filter can be made switchable by a proper circuit layout along with the incorporation of diodes to change the resonance characteristics of quarter-wavelength resonators. An on-off isolation of more than 20dB up to 3 has been achieved. In addition, by utilizing the inherent transmission zeros of coupled-lines, the 30dB stopband bandwidth of proposed filter can be extended up to 4 . Moreover, by manipulating the phase of input reflection coefficient, we can implement diplexers based on proposed filter structures with smaller circuit size than conventional designs. Additional cross-coupling between non-adjacent coupled-line sections can also be introduced to improve the selectivity. In this work, the characteristics of different kinds of coupled-line sections are thoroughly investigated to make the best use of them in bandpass filter and diplexer designs. Simple and clear design flows have also been proposed for all designs, which allow the easy extension of proposed filter structures for further improvement in the future.
33
LIU, YU HUA, i 劉宇華. "GENERALIZED TRANSMISSION LINE MODEL FOR CYLINDRICAL RECTANGULAR MICROSTRIP ANTENNAS". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/06093315683568807817.
Pełny tekst źródłaStreszczenie:
碩士國立中山大學
電機工程研究所
83
Due to their conformability the cylindrical-rectangular microstrip antennas have received much antention. In this paper we present a simple analysis method of using generalized transmission line model (GTLM) theory. The excitation of the patch antenna by a probe and microstripline is consider here, and this study is still not available in the open literature. To apply the GTLM theory, the microstrip antenna is model as a sections of transmission lines taken in the direction that joins the radiating edges and loaded with wall admittance at the radiating edges. The mutual admittance between the radiating edges is included in the GTLM solution. The equivalent circuit that describes the GTLM analysis is given, and the expressions for the circuit element are derived. The input impedance of the microstrip antenna is then formulated. Numerical results of the input impedance are calculated and presented as a function of cylinder radius and substrate thickness. To analyze the accuracy of the GTLM solutions, the obtained results are also compared with the measured data.
34
Mu, Wei-Yu, i 穆威宇. "Circularly Polarized Patch Array Antenna Fed by Microstrip Line". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/39390486878014567355.
Pełny tekst źródłaStreszczenie:
碩士國立臺灣大學
電信工程學研究所
94
Because of its ability of reducing the multipath reflections and several kinds of interference, circular polarization (CP) has been widely used in many applications of microwave frequencies recently. Microstrip antennas are also widely known of their advantages like low profile, light weight, simple structure, and easy to integrate with other circuits. However the narrow bandwidth is an undesirable disadvantage that limits seriously the application of the microstrip antenna. In order to overcome this undesirable disadvantage of microstrip antenna, sequentially rotated feeding technique is used to increase both the impedance bandwidth and the axial ratio bandwidth. In this thesis, several kinds of wide-bandwidth and high-gain circularly polarized patch array antenna with sequentially rotated feeding technique fed by the microstrip line are presented. They preserve both the advantages of the circular polarization and the microstrip antenna, and are very suitable for microwave and millimeter-wave applications.
35
Lai, Tzung-Ming, i 賴宗民. "60GHz Circularly Polarized Patch Antenna Fed By Microstrip-Line". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/79662606738977730585.
Pełny tekst źródłaStreszczenie:
碩士國立臺灣大學
電信工程學研究所
93
In this thesis, a circularly polarized patch antenna fed by a microstrip-line is designed for the 60GHz (V-Band) communication system. In order to increase the bandwidth and polarization purity, a wide bandwidth microstrip-line fed circularly polarized patch array is proposed by combining the principle of sequential rotation technique and the 90° phase delay line for spatial rotation. Based on the cavity model, the Helmholtz’s equation is solved to obtain the modes exist in the circular cavity resonator. From the mode analysis results, the electric current distribution patterns on the patch and the ground plane are computed. Because we need increase the bandwidth and the polarization purity, a microstrip-line fed circularly polarized patch array is proposed by employing the principle of sequential rotation technique. The simulated and measured return losses are presented for an 1x2 array with and without sequential rotation technique. Significant increase in the return loss bandwidth is found in the array with sequential rotation. Because the proposed antenna is fed by the microstrip-line, in addition to the advantages of simple structure, lightweight, low profile, easy to combine with the circuit, and fabricate, this antenna is especially suitable for millimeter-wave application.
36
HUANG, BAO-REN, i 黃保仁. "Elimination of Far-end Noise on Coupled Microstrip Line". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34989154695730269158.
Pełny tekst źródłaStreszczenie:
碩士國立臺灣科技大學
電子工程系
101
In this thesis, to eliminate the common mode noise induced by the right-angled differential transmission line, an inductance-compensated and capacitance-compensated right-angled differential transmission line is proposed. The frequency-domain differential-to-common mode conversion is greatly reduced, having a maximum reduction of 30 dB, and the time-domain common mode noise is reduced from 0.056 V to 0.019 V. Besides, as compared with the inductance-compensated right-angled differential transmission line or the capacitance-compensated right-angled differential transmission line, the circuit size is greatly reduced, which in turn saves the production cost and reduces the low frequency reflection coefficient. Besides, to reduce the far-end crosstalk noise induced by the coupled microtrip line, a coupled microstrip line using the front-end capacitor is proposed. As compared with the literatures, the coupled microstrip line using the front-end capacitor can eliminate the routing complexity and reduce the far-end crosstalk noise from 55 mV to 26.8 mV. Also, since the far-end crosstalk noise has an antisymmetric waveform, the far-end crosstalk noise can be totally eliminated when the receiver uses an integrator. In order to reduce the near-end impulse crosstalk noise and further reduce the far-end crosstalk noise induced by the coupled microstrip line using the front-end capacitor, a coupled microstrip line using the distributed capacitors is proposed. As compared with the coupled microstrip line using the front-end capacitor, the near-end crosstalk noise can be reduced from 71 mV to 28 mV while the far-end crosstalk noise is nearly zero.
37
Wu, Meng-huan, i 吳孟桓. "Microstrip Parallel-Coupled Line Bandpass Filter with Multispurious Suppression". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/68223203762633307525.
Pełny tekst źródłaStreszczenie:
碩士國立交通大學
電信工程系所
94
The inherent zero of a microstrip coupled stage near twice the design frequency (2fo) is found tunable by varying its coupling length. This zero is used to suppress the unwanted response of paralle-coupled line filters at this frequency. The above idea is extended to design over-coupled middle stages of the filter for the spurious |S21| peaks at 3fo and 4fo, so that the upper stopband can be greatly enhanced to 5fo. The passband preserves a response as good as the traditional design. Measured results have a good agreement with simulation data and show that the idea works very well. Corrugated coupled lines are also devised to design microstrip bandpass filters with multispuriois suppression. Quarter-wave corrugated stages are tuned to allocate inherent transmission zeros at 2fo and 4fo. Stages with proper coupling lengths are arranged to cancel the unwanted peaks at 3fo, 6fo and 7fo, and the tapped input/output scheme is employed to tackle that at 5fo. The measured data of designed bandpass filters show rejection levels better than 30dB in the upper stopband. Three circuits are fabricated and measured to demonstrate the idea. Periodic stepped-impedance resonators (PSIRS) are proposed to design bandpass filters for multispurious suppression. Denoted as PSIRN, a PSIR of ��/2 long at design frequency fo consists of N periods of hi-Z and low-Z sections. A PSIRN coupled section shows transmission zeros at various frequencies. The zero can be tuned by changing the impedance ratio of the hi-Z and low-Z sections, and be adopted to suppress the spurious peaks. Responses of the PSIR filters show good rejection in the upper stopband.
38
Hsu, Hsiao-Lun, i 徐孝倫. "characteristics of microstrip line with periodically corrugated ground plane". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/51027282946600310115.
Pełny tekst źródłaStreszczenie:
碩士國立中興大學
電機工程學系
89
A mode-matching technique combined with a spectral domain reprsentation is used to study the transmission properties of microstrip lines with a periodically corrugated ground plane. The field components in the corrugated region are expanded by standing wave mode functions in the propagation direction and by a Fourier integral in the transversal direction. Integral equations are formed in terms of the surface currents on the microstrip. Dispersion relation is then obtained by applying method of moments to solve the integral equations. Various geometrical and electrical parameters affecting the passband/stopband characteristics of the first stopband are investigated.
39
Fu-Mao, Hsieh, i 謝馥懋. "The Design of Microstrip-Line-Fed Printed Slot Antenna". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/74375620362534848658.
Pełny tekst źródłaStreszczenie:
碩士南台科技大學
電子工程系
93
The novel designs of printed slot antennas for broadband characteristic have been investigated in this thesis. About this thesis, the designs of printed slot antennas all adopt the method of microstrip-line-fed, they can be classified into two main types of microstrip-line-fed isosceles triangular slot antenna and rectangular slot antenna, and impedance bandwidth of these proposed designs can achieved 77% and 104%, respectively. To begin with, the microstripline feed isosceles triangular slot antenna for broadband operation, the proposed antenna with a small rectangular slot of dimensions L×W, loaded on vertex of the isosceles triangular slot and centered above the microstrip feed line. Under the new structure, the proposed antenna leads to the advantages of broadband, high antenna gain and good co-polarization level. Next, to base on the broadband design of the isosceles triangular slot, we design a structure of rectangular slot antenna with a small trapezoid slot and to perform the purpose of broadband operation. Naturally, we focus on the characteristics of impedance matching, radiation patterns and antenna gain to analyze and study, too.
40
Chou, Wen-fu, i 周文富. "Novel Design for SMA Connector-to-Microstrip Line Transitions". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/9v974d.
Pełny tekst źródłaStreszczenie:
碩士國立臺北科技大學
電腦與通訊研究所
97
The goal of this thesis is mainly to improve the transmission characteristics of the SMA connector-to-microstrip line transitions. The 1-dB passband of the traditional transitions is only up to 15 GHz. This thesis proposes innovative designs for the transitions in order to increase the 1-dB passband. A metallic ring is attached to the conventional SMA connectors. This ring functions as a buffer between the SMA connector and the microstrip line to reduce the insertion loss caused by the sudden change of the electromagnetic fields from one transmission line to another. Additional modifications on the ground plane of the substrate can effectively improve the transmission characteristics of the transitions, and therefore can promote their value for high-frequency applications. The thesis also evaluates the transmission characteristics of the proposed designs for the transitions. Sensitivity study of the proposed transitions subject to fabrication errors is conducted. Solutions are presented for some cases resulting in severe insertion loss. The applications of the proposed designs to various substrates, transmission lines, and SMA connectors are also examined to demonstrate their wide applicability. The finite element method-based simulation tool, HFSS, is employed to conduct the required simulations for the proposed designs. Optimum design parameters are presented to maintain minimum insertion loss within the transmission passband of interest. The back-to-back connected structure of the transitions and the TRL calibration-based measurement technique are selected for the measurements of the proposed designs to validate their simulation results. The measured data of the back-to-back structure of the design are in good agreement with the simulation results. The TRL calibration-based measurement technique is developed to measure the frequency response of a single transition. The experimental results show that the 1-dB passband is improved to 26 GHz, which is a 73% increase compared to the conventional transitions.
41
Tsai, Ren-Fu, i 蔡仁輔. "Microstrip Bandpass Filters Using Dual Transmission Line Stepped Resonators". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/sa64c9.
Pełny tekst źródła
42
Welch, Joshua Adam. "Characterization and reduction of line-to-line crosstalk on printed circuit boards". Thesis, 2018. http://hdl.handle.net/2097/39286.
Pełny tekst źródłaStreszczenie:
Master of ScienceDepartment of Electrical and Computer Engineering
William B. Kuhn
An important concern for high speed circuit designs is that of crosstalk and electromagnetic interference. In PCB board-level designs, crosstalk at microwave frequencies may result from imperfections in shielding of PCB interconnects or more generally transmission lines. Several studies have been done to characterize and improve the isolation between PCB transmission lines for both digital and RF circuits. For example, previous studies in the microwave region have examined the effect that line type, line length, and separation have on crosstalk and suggest that without full shielding, the upper limit of isolation is on the order of 60dB for traditional board-level lines [1]. In order to more fully characterize crosstalk and improve isolation above 60 dB, this thesis studies signal-to-ground-plane separation, considers advanced line types, and examines the effect of 3D shielding. Results are presented from 100MHz to 30GHz for the traditional transmission line structures of microstrip, CPW, differential pair and CPW differential pair. This study shows that with a halving of distance between signal and ground planes, isolation between transmission lines can be reduced by as much as 20dB, making this one of the best ways to improve performance. Advanced methods of shielding are then presented. Direct launch stripline and single-sided CPW improve upon existing crosstalk reduction techniques, while split shielding and ablation of dielectric PCB material are also proposed. The data and additional crosstalk reduction techniques discussed in this thesis serve two purposes. One: with a more complete understanding of the effects that transmission line types and parameters have on crosstalk, engineers can quickly identify potential crosstalk issues and resolve them before manufacturing. Second, this thesis presents the engineer with four new additional techniques that may become available in advanced manufacturing environments. Such techniques can further reduce crosstalk and may allow for isolation values to approach 100 dB at the PC board level.
43
Teng, Chi-Huan, i 鄧跡寰. "Design of the Microstrip Couplers with Arbitrary Power Ratio and Microstrip Bandpass Filter with the Stepped Coupled Line". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/65560166977257394692.
Pełny tekst źródłaStreszczenie:
碩士國立中正大學
電機工程研究所
101
This paper presents two designs. First, a novel design equations and examples of the modified arbitrary power ratio microstrip tandem coupler are presented. In order to obtain a wide passband, couplers with triple poles at the return loss are proposed. Compared to the conventional couplers such as Lange couplers and parallel coupled line couplers, high impedance transmission lines and narrow coupling gaps are not required for the proposed microstrip coupler. In terms of measured results, there is a wide bandwidth of more than 70%. Moreover, good agreement between theoretical predication and measurement validates our proposed structure. In the second design, a novel wide passband microstrip bandpass filter with broader stopbands is provided. The proposed bandpass filters is composed of the stepped coupled line and two short-circuited stubs. Each stage of electrical length of the stepped coupled line has been optimized and cascaded together for harmonic suppression. Moreover, the stepped coupled line with weak–strong–weak coupling results in a wide stopband. Furthermore, with short-circuited stubs connected at the input/output port, there is a steeper passband skirt and broader passband. In addition, the agreement between theoretical prediction and measurement validates our proposed structure.
44
SU, ZHE-WEI, i 蘇哲尉. "Analyses of dispersion characteristics of a shielded multilayer microstrip line". Thesis, 1988. http://ndltd.ncl.edu.tw/handle/24726451891423920217.
Pełny tekst źródła
45
Chen, Pow-Wen, i 陳柏彣. "The Novel Bandpass Filter Designs Using the Microstrip Line Structure". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/55574604069610218619.
Pełny tekst źródłaStreszczenie:
碩士國立彰化師範大學
電信工程研究所
96
Abstract In this thesis, multi-band microwave bandpass filters (BPFs) designed using cross-coupled stepped-impedance resonators (SIRs) were studied. Three microwave filters,including two dual-band and one single-band BPFs were designed, implemented, andinvestigated. The first dual-band BPF circuit consists of λ/2 and λ/4 stepped impedance resonators (SIRs) for the WLAN applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2-5.8 GHz. The doubly parallel-coupling mechanism is used in the filter design to reduce the insertion losses and to gain a wider bandwidth (BW). The cross coupling configuration and the tapped-line I/O feed are adopted in this filter design to provide the attenuation poles for improving the signal selectivity and stopband rejection levels. Experiments were conducted to verify the circuit performance. The second BPF proposed in this thesis was a dual-band bandpass filter using λ/4 stepped impedance resonators (SIRs) embedded with spur-line for the WLAN applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2-5.8 GHz . The crossly coupled mechanism is used in the filter design to provide attenuation poles by the passband edges for enhancing the signal selectivity and to increase stopband rejection levels. The tapped-line is incorporated in feed structure to save the circuit space. The spur-line is embedded in each I/O SIRs to push the upper stopband limit to a higher frequency. Experiments are conducted to verify the circuit performance. A good agreement is observed between the simulation and the measurement. Finally, we employ the stepped-width-slots spur-line (SWSS) in the parallel-coupled microstrip BPF to eliminate the higher harmonics due to coupled-lines’ even- and odd-mode effect. The ABCD matrix of the SWSS based on the even- and odd-mode of parallel-coupled line model is developed to analyze the structure frequency response. Single SWSS or two SWSSs are embedded in each of the coupled-lines to suppress signals of multiple frequencies for extending stopband region. Results obtained in this research can be applied to commercially practical RF and microwave systems. The techniques presented in this research are expected to serve as a useful reference for microwave filter designers in this and related research fields.
46
Yau, Chyi-kwei, i 邱其奎. "Microstrip Line to Substrate Integrated Waveguide Transition and Antenna Applications". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/96225178319729886543.
Pełny tekst źródłaStreszczenie:
碩士國立臺灣大學
電信工程學研究所
95
This thesis proposes two kinds of vertical transitions between microstrip line and substrate integrated waveguide (SIW), and a slot array antenna feeding by our transition structure. All these structures are fabricated on low-temperature co-fired ceramic (LTCC) substrate. This thesis also presents the equivalent circuits of both transition structures. The microstrip line is on the upper layer, and the SIW is on the bottom layer with the vertical metal walls realized by closely spaced vias. The first transition design is realized by a shorted via between the end of the microstrip line and the bottom layer of SIW. A current is induced on the via and energy is coupled to SIW. Another transition structure is realized by opening a slot on the top wall of SIW and feeding by a 1/4λg microstrip line open stub. With the magnetic current induced on the slot, the transition is achieved. The design of slot array antenna is also achieved by opening slots on SIW, and the power is radiated from the slots. The radiated power and center frequency are adjusted by the slot position and slot length. All our structures are designed at Ka-band. Both the transition structures exhibit about 40% fractional bandwidth with -15dB return loss and the measurement results agree with our simulation.
47
Lin, Yen-Chung, i 林沿鍾. "Quality Factor Measurement of Dielectric Resonator Through Microstrip Line Coupling". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/86692727166109963668.
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碩士國立臺灣大學
電信工程學研究所
96
Dielectric resonator (DR) is made of high dielectric constant materials and acts as a cavity enclosed by perfect magnetic conductor (PMC). Because of the high dielectric constant, its dimensions are much smaller than other types of resonators at the same frequency. Take the 8700 series DRs offered by Trans-Tech for example. Its εr 30, hence its electrical length is about 5.5 times smaller than that of an air-filled cavity. Besides, dielectric resonator has ultra high quality factor, resulting in a quite narrow operating bandwidth. Therefore, dielectric resonator is widely used in the microwave and millimeter wave circuits, for example, antennas, filters and oscillators. In many aspects, the quality factor of dielectric resonator is the major characteristic to be taken into account in the microwave circuit design. Especially in filter design, for example, the method given in [1], after giving the design parameters of a filter, the circuit layout would meet the design requirements by measuring the first-order external Q of the resonator. In other words, an accurate and effective quality factor measurement becomes an important issue in the applications of dielectric resonator. For this reason, this thesis uses the method developed in [2]. In Chapter one, we give a brief description of quality factor and dielectric resonator, then present some basic measurement models [3] based on the simple equivalent circuits. After the discussion about the advantages and disadvantages of this model, we then take more complicated situations into account based on [4] and describe in Chapter two. Finally, we consider the situation about the dielectric resonator coupled to a microstrip line in Chapter three with simulation and measurement results.
48
HUANG, CHIH YU, i 黃智裕. "STUDIES OF CYLINDRICAL MICROSTRIP ANTENNAS USING GENERALIZED TRANSMISSION LINE MODEL". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/88278288278458136750.
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博士國立中山大學
電機工程研究所
84
Analysis of microstrip antennas on cylindrical body using generalized transmission line model (GTLM) theory is presented in this dissertation. This method has the advantages of simplicity and time efficiency on analysis of the microstrip antenna. Base on the GTLM theory, a single probe-fed circular microstrip antenna was first investigated. It can be represented by a transmission line loaded with a wall admittance at the radiating edge, an equivalent circuit for calculating the input impedance of the microstrip antenna can be obtained. The input impedance of different feed positions were analyzed and discussed. The curvature effects are major subjects of the presented study. Another feed method, the slot- coupled circular and rectangular microstrip antennas were also studied. By introducing equivalent transformers concept to explain the coupling mechanism, it is easy to realized the equivalent circuit by using transmission line theory. Finally, the analysis of mutual coupling between two probe-fed circular microstrip antennas both on a cylindrical and planar surface is presented. Numerical results demonstrated that the substrate loss tangent play a role on input impedance and the mutual coupling coefficients. The curvature effects for typical results on E- and H- plane coupling were presented.
49
Cheng, Yuan-Shun, i 鄭元順. "Transmission Characteristics of Microstrip Line Periodically Loaded with Rectangular Patches". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/61960459500327114574.
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碩士國立臺灣大學
電信工程學研究所
90
In this thesis, an analysis of microstrip line periodically loaded with rectangular patches is presented. Floquet's theorm and hybrid-mode spectral domain approach are used to derive a set of coupled integral equations, and method of moments is used to transform the coupled integral equations into a determinantal equation from which the dispersion characteristics are obtained. Singularities for critical space harmonics in the wavenumber plane are reviewed systematically. Numerical results for the first passband and stopband characteristics are presented.
50
Wu, Ching-Lung, i 巫金龍. "Time-Domain Analysis of a Bend of Differential Microstrip Line". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/98155757089399222654.
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碩士大同大學
通訊工程研究所
93
Abstract The technique of the electronic industry moving fast, the conventional single-end transmission line can not meet the fast speed enough, and the differential transmission lines are more important to be used in all electronic industry field. The advantages of the differential lines are of fast transmission speed, immunity against electromagnetic interference, but the drawback is necessary to support 2 symmetry characteristic transmission line(same impedance) and equalize propagation delay，the differential signal will not distortion and function down. The 90�a bend differential transmission lines will not used in high-seed PCB(Print Circuit Board)circuit, this is because the mismatch impedance and undesired phase delay will cause the distortion problem. So the conventional skill can only to deal with the 90�a bend of differential transmission lines with two 45�a bends, and the two 45�a bends distance can not be too near together to cause the distortion signal. More fast-speed and smaller packages are the trend in the future, so there is not more large space in PCB for two 45�a bend microstrip, the 90�a bend differential transmission lines is a good chose for small PCB space and high-speed circuit today, but need to improve the un-equalize propagation delay problem. The object of this thesis is to propose a method for compensate an un-desired phase delay caused by unequal-length differential transmission line-s. The propagation delay of a bend of differential transmission lines can be improved by disposing structure to the unequal-length differential transmission lines We use the FTDT simulation software to simulate the bend of differential transmission lines. And the method extracts the L(Self inductance), C(Self capacitance), Lm(Mutual inductance), Cm(Mutual capacitance) to mo-del the coupling circuit, and analyze the circuit difference. Finally we measure the unequal-length differential transmission lines jitter of eye-pattern function of Sampling Scope.