Дисертації з теми "Device on the microstrip lines"

An analysis using numerical methods can calculate electrical and construction characteristics parameters of microwave devices quite accurately. However, numerical methods require a lot of computation resources and time for calculations to be made. Rapid perfection of the computer technologies and software with implementation of the numerical methods has laid down the conditions to the rapid design of the microwave devices using computers.
Disertacijoje nagrinėjamos mikrobangų įtaisų analizės ir sintezės proble-mos, taikant lygiagrečiąsias kompiuterines sistemas. Pagrindiniai tyrimo objektai yra daugialaidės mikrojuostelinės linijos ir meandrinės mikrojuostelinės vėlinimo linijos. Šie objektai leidžia perduoti, sinchronizuoti bei vėlinti siunčiamus signalus ir yra neatsiejama dalis daugelio mikrobangų prietaisų. Jų operatyvi ir tiksli analizė bei sintezė sąlygoja įtaisų kūrimo spartinimą. Pagrindinis disertacijos tikslas – sukurti lygiagrečiąsias metodikas ir algoritmus, skirtus sparčiai ir tiksliai atlikti minėtų linijų analizę ir sintezę. Sukurtų algoritmų ir metodikų taikymo sritis – mikrobangų įtaisų modeliavimo ir automatizuoto projektavimo progra-minė įranga.

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CAPES
O presente trabalho aborda o desenvolvimento e a implementação de acopladores híbridos em quadratura mais compactos e com largura de banda e desempenho similares as do acoplador branch-line convencional. Para isso, fez-se uso de uma classe de estruturas denominadas linhas de transmissão artificiais (LTA). Uma nova estrutura desse tipo, composta por três linhas de transmissão conectadas em cascata, é analisada e utilizada neste trabalho. Foram derivadas equações matemáticas para o projeto deste tipo de estrutura que podem ser utilizadas para obter LTAs com uma matriz de espalhamento idêntica, para uma dada frequência de operação, a de uma linha de transmissão com uma impedância característica e comprimento elétrico quaisquer. Essa técnica foi aplicada no projeto de acopladores híbridos em quadratura em microfita para as bandas GSM em 920 MHz e ISM em 2.45 GHz usando-se o substrato FR-4 com espessura de 1.6 mm. Obteve-se dispositivos com áreas aproximadamente 70% menor do que a área do acoplador branch-line convencional operando em 920 MHz e aproximadamente 50% menor do que o acoplador de 2.45 GHz. Os acopladores obtidos foram simulados, fabricados e medidos, mostrando que os seus desempenhos são comparáveis aos dos acopladores convencionais. A técnica desenvolvida neste trabalho é geral o suficiente para ser aplicada ao projeto de outros dispositivos que usem trechos de linhas de transmissão.
This thesis is concerned with the design and implementation of compact hybrid couplers with similar bandwidth and performance to the conventional branch-line coupler. To achieve this, a class of structures, called artificial transmission line (ATL), was used. A new structure of this type, made of three transmission lines connected in cascade, is analyzed and used. Mathematical equations have been derived for the design of this type of structure that can be used to obtain ATLs with an identical scattering matrix, for a given frequency of operation, to that of a transmission line with a given characteristic impedance and electrical length. This technique was applied in the design of microstrip quadrature hybrid couplers for the 920 MHz GSM band and for the 2.45 GHz ISM band using a 1.6 mm-thick FR-4 substrate. These couplers have surface areas approximately 70% smaller than the area of the conventional branch-line coupler operating at 920 MHz and approximately 50% for the 2.45 GHz coupler. The couplers obtained were simulated, manufactured and tested, showing that their performances are comparable to the conventional coupler. The technique developed here is general enough to be applied to the design of other devices using transmission line sections.

L’objectif de ces travaux est pour d’apporter des solutions innovantes à la réalisation de dispositifs passifs performants et compacts, susceptibles d’intéresser les concepteurs de circuits RF et millimétriques. Ces dispositifs sont basés notamment sur des lignes microrubans à ondes lentes sur substrat structuré, que cela soit sur PCB avec des vias borgnes pour la RF, ou nanostructurés sur membranes à nanofils pour le millimétrique. Les travaux complets comprennent (i) une analyse de la topologie, (ii) un développement du modèle équivalent validée par des simulations électromagnétiques (HFSSTM) et des mesures sur PCB et sur des membranes brésiliennes en millimétrique, (iii) des abaques de conceptions et (iv) des applications à la conception des nouveaux dispositifs passifs miniaturisés. Notre lignes offrent une grande souplesse de conception et peuvent être placées indifféremment sur le substrat structuré sans modification de leurs paramètres électriques. Un nouveau coupleur hybride miniaturisé par l’utilisation de cette ligne est présenté comme une preuve de concept. Pour aller plus loin, une étude comparable des structures de lignes microrubans couplées à ondes lentes est développée. Le principe du couplage sur substrat structuré est d’abord exposé avec une présentation de ses avantages et inconvénients, puis un modèle est également proposé dans le but de réaliser un coupleur co-directif 0-dB miniaturisé par l’utilisation de ces lignes. De plus, un des parties essentielles de ces travaux concerne l’utilisation de la structure microruban à onde lente pour la miniaturisation de dispositifs passifs non-réciproques : un nouvel isolateur microruban compact avec l’introduction de vias dans le ferrite et une nouvelle conception de circulateur miniaturisé sur le substrat ferrite-diélectrique avec un réseau de vias borgnes
This work focuses on providing innovate solutions into the realization of high-quality and compact passive devices for designer on RF and millimeter-wave bands. These devices are based on slow-wave microstrip lines on structured substrate, either on PCB with blind vias for RF applications, or on metallic nanowire membrane. The complete works include (i) an analysis of topology, (ii) a development of equivalent model validated by the electromagnetic simulations (HFSSTM) and the measurements, (iii) design charts and (iv) applications on design of novel miniaturized passive devices. These transmission lines give the flexibility for designers and capability to be indifferently placed on structured substrate without any impact on their electrical parameters. A novel miniaturized hybrid coupler using this line is proposed, as a proof of concept. In the other hand, a comparable study on the structure of slow-wave coupled microstrip lines is developed. The principal of coupling on structured substrate is shown for their advantages and drawbacks and then an electrical model is also proposed in order to realize a miniaturized 0-dB forward-wave directional coupler using these lines. Moreover, an essential part of this thesis concerns the utilization of the slow-wave microstrip structure to miniaturize the non-reciprocal passive devices: a novel microstrip isolator with the introduction of vias inside the ferrite and a novel design of the miniaturized circulator on a ferrite-dielectric substrate with blind vias

Thesis (M.Phil.)--City University of Hong Kong, 2009.
"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Master of Philosophy." Includes bibliographical references.

Series-fed printed slot antenna arrays excited by microstrip lines are low profile, easy to manufacture, low cost structures that found use in applications that doesn&rsquo
t require high power levels with having advantage of easy integration with microwave front-end circuitry. In this thesis, design and analysis of microstrip line fed slot antenna arrays are investigated. First an equivalent circuit model that ignores mutual coupling effects between slots is studied. A 6-element array is designed by using this equivalent circuit model. From the measurement and electromagnetic simulation results of this array, it is concluded that mutual coupling effects should be considered in order to achieve a successful design that meets the design specifications related to the main beam direction and sidelobe levels of the antenna. Next, an improved equivalent circuit model proposed for stripline fed slot antenna arrays is studied. It is observed that, the mutual coupling effects are incorporated into the equivalent model through the utilization of active impedance concept. Finally, the design equations proposed in the improved equivalent circuit model are derived for the microstrip line fed slot antenna array structure. To demonstrate the validity and the accuracy of the derived design equations, results obtained by the proposed analysis method are compared with simulation and measurement results. It is concluded that the proposed method successfully predicts the radiation pattern of the array by including the mutual coupling effects.

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.

Full wave analysis of microstrip lines at microwave frequencies is performed by using method of moments in conjunction with closed-form spatial domain Green&rsquo
s functions. The Green&rsquo
s functions are in general Sommerfeld-type integrals which are computationally expensive. To improve the efficiency of the technique, Green&rsquo
s functions are approximated by their closed-forms. Microstrip lines are excited by arbitrarily located current sources and are terminated by complex loads at both ends. Current distributions over microstrip lines are represented by rooftop basis functions. At first step, the current distribution over a single microstrip line is calculated. Next, the calculation of the current distributions over coupled microstrip lines is performed. The technique is then, applied to directional couplers. Using the current distributions obtained by the analysis, the scattering parameters of the structures are evaluated by using Prony&rsquo
s method. The results are compared with the ones gathered by using simulation software tools, CNL/2&trade
and Agilent Advanced Design System&trade
(ADS).

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.

There are investigated accuracy issues of edges and ends evaluation problems of meander slow-wave systems in the dissertation. Objects of research – mathematical models of multiconductor and meander microstrip delay lines, numerical analysis methods. Aim of the work – after creating mathematical models, based on finite difference time domain method, explore ends and edges discontinuity effects on meander microstrip delay lines time and frequency characteristics, propose structural improvement measures of meander delay line. The dissertation approaches major tasks such as: mathematical individual, coupled, multiconductor microstrip lines models composition for performance and their properties investigation using finite difference and finite difference time domain methods of analysis; synthesis algorithm of multiconductor microstrip lines and analysis algorithm of meander microstrip delay line and methodology of their electrical characteristics calculation creation. The thesis consists of four parts including introduction, 4 chapters, conclusions, references. The introduction reveals investigated problem, importance of the thesis and object of research. It also describes the purpose and tasks of the dissertation, research methodology, scientific novelty and the practical significance of results examined in the thesis and defended statements. The introduction ends in presenting the author’s publications on the subject of the defended dissertation, offering the material of made... [to full text]
Disertacijoje sprendžiama lėtinimo sistemų kraštinių ir galinių laidininkų įtakos modelių tikslumui įvertinimo problema. Pagrindiniai tyrimo objektai – daugialaidžių ir meandrinių mikrojuostelinių linijų matematiniai modeliai, skaitiniai analizės metodai. Darbo tikslas – sukūrus modelius, grįstus baigtinių skirtumų laiko srities metodu, ištirti galinių ir kraštinių laidininkų netolygumų įtaką meandrinių mikrojuostelinių vėlinimo linijų laiko ir dažninėms charakteristikoms, pasiūlyti meandrinių vėlinimo linijų konstrukcijų tobulinimo priemones. Darbe sprendžiami uždaviniai: matematinių pavienės, susietųjų ir daugialaidžių mikrojuostelinių linijų modelių sudarymas ir savybių tyrimas, taikant baigtinių skirtumų bei baigtinių skirtumų laiko srities analizės metodus; daugialaidžių mikrojuostelinių linijų sintezės ir meandrinių mikrojuostelinių vėlinimo linijų analizės algoritmų bei jų elektrinių charakteristikų skaičiavimo metodikų sudarymas. Disertaciją sudaro įvadas, keturi skyriai, bendrosios išvados, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašai. Įvadiniame skyriuje formuluojama tiriamoji problema, aptariamas darbo aktualumas, aprašomas tyrimų objektas, formuluojamas darbo tikslas bei uždaviniai, aprašoma tyrimų metodika, darbo mokslinis naujumas, rezultatų praktinė reikšmė, ginamieji teiginiai. Įvado pabaigoje pristatomi pranešimai konferencijose disertacijos tema bei pateikiama disertacijos struktūra. Pirmajame skyriuje pateikiama literatūros... [toliau žr. visą tekstą]

Microstrip structures became very attractive with the development of cost-effective dielectric materials. Among several techniques suitable to the analysis of such structures, the discrete mode matching method (DMM) is a full-wave approach that allows a fast solution to Helmholz equation. Combined with a full-wave equivalent circuit, the DMM allows fast and accurate analysis of microstrips lines on multilayered substrates.

 

The knowledge of properties like dispersion and electromagnetic fields is essential in the implementation of such transmission lines. For this objective a MATLAB computer code was developed based on the discrete mode matching method (DMM) to perform this analysis.

 

The principal parameter for the analysis is the utilization of different dielectric profiles with the aim of a reduction in the dispersion in comparison with one-layer cylindrical microstrip line, showing a reduction of almost 50%. The analysis also includes current density distribution and electromagnetic fields representation. Finally, the data is compared with Ansoft HFSS to validate the results.

The German Aerospace Center has rights over the thesis work

Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2009
This thesis presents the design, analysis and implementation of an eight-element phased array antenna for wideband X-band applications. The microstrip phased array antenna is designed using eight quasi-Yagi antennas in a linear configuration and is printed on RT/Duroid 6010LM substrate made by Rogers Corporation. The feeding network entails a uniform beamforming network as well as a non-uniform -25 dB Dolph-Tschebyscheff beamforming network, each with and without 45° delay lines, generating a squinted beam 14° from boresight. Antenna parameters such as gain, radiation patterns and impedance bandwidth (BW) are investigated in the single element as well as the array environment. Mutual coupling between the elements in the array is also predicted. The quasi-Yagi radiator employed as radiating element in the array measured an exceptional impedance bandwidth (BW) of 50% for a S11 < -10 dB from 6 GHz to 14 GHz, with 3 dB to 5 dB of absolute gain in the frequency range from 8 GHz to 11.5 GHz. The uniform broadside array measured an impedance BW of 20% over the frequency band and a gain between 9 dB to 11 dB, whereas the non-uniform broadside array measured a gain of 9 dB to 11 dB and an impedance BW of 14.5%. Radiation patterns are stable across the X-band. Beam scanning is illustrated in the E-plane for the uniform array as well as for the non-uniform array.

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.

Recientes descubrimientos han hecho posible la creación de un nuevo tipo de materiales: los metamateriales. En sólo algunos años, el desarrollo de esta nueva rama científica ha dado lugar a numerosos descubrimientos y avances tecnológicos basados en las nuevas propiedades que exhiben estos nuevos materiales. Esta tesis recoge parte del trabajo desarrollado durante los últimos años por el grupo GEMMA y CIMITEC en la aplicación de líneas de transmisión de tipo resonante en el desarrollo de dispositivos de microondas. Su pequeño tamaño y la controlabilidad de sus propiedades eléctricas son las principales propiedades de las líneas metamaterial basadas en resonadores concentrados que posibilitan su empleo en el diseño de dispositivos de microondas de pequeñas dimensiones. Estos dispositivos son de interés especialmente en aquellas aplicaciones en las que un reducido tamaño es un requerimiento importante. No obstante, además de su reducido tamaño, dichos dispositivos pueden ofrecer mejoras en su respuesta y e incluso nuevas funcionalidades. El documento ha sido escrito como compendio de 13 artículos. Dichos artículos contienen gran parte de los resultados desarrollados durante la realización de esta tesis y se detallan en una lista más adelante. El documento se ha dividido en varias secciones dedicadas a diferentes aspectos:
-En el segundo capítulo se presenta una breve introducción sobre metamaterials y materiales zurdos, incluyendo sus propiedades y sus elementos constitutivos. Se dedica una especial atención a la aplicación de dichos conceptos a estructuras planares y la síntesis de líneas de transmisión metamaterial.
-El tercer capítulo trata sobre la implementación de líneas de transmission metamaterial mediante el modelo resonante, que es el empleado en este trabajo. Se presentan y estudian diferentes tipos de líneas de transmission metamaterial, con especial énfasis en las estructuras empleadas en las aplicaciones presentadas en el capítulo 4. -El cuarto capítulo se dedica a las aplicaciones de las estructuras ya presentadas al diseño de components concretos, incluyendo diferentes tipos de divisors de potencia, filtros de banda ancha y estrecha y estructuras reconfigurables basadas en materiales ferroeléctricos. -Por ultimo, el quinto capítulo incluye las conclusions y posibles futuros objetivos.
ARTÍCULOS: Debido a la normative, los artículos marcados con un asterisco (*) no pueden ser considerados como parte fundamental de esta tesis, bien por ser artículos presentados a conferencias especializadas en lugar de revistas de investigación, o pore star pendientes de publicación en el momento del depósito de esta tesis. -Article A: M. Gil, J. Bonache, I. Gil, J. García-García and F. Martín, "On the transmission properties of left handed microstrip lines implemented by complementary split rings resonators", Int. Journal Numerical Modelling: Electronic Networks, Devices and Fields, vol. 19, pp 87-103, 2006. -Article B: M. Gil, J. Bonache, I. Gil, J. García-García and F. Martín, "Miniaturization of planar microwave circuits by using resonant-type left handed transmission lines", IET Microwave Antennas and Propagation, Vol.1, pp. 73-79, 2007. -Article C: M. Gil, I. Gil, J. Bonache, J. García-García and F. Martín, "Metamaterial transmission lines with extreme impedance values", Microwave and Optical Technology Letters, vol. 48, pp. 2499-2505, 2006. -Article D*: M. Gil, J. Bonache, I. Gil, J. García-García and F. Martín, "Artificial Left¬handed Transmission Lines for Small Size Microwave Components: Application to Power Dividers", presented at 36th European Microwave Conference (EuMC), Manchester (UK), pp. 1135-1138, 2006.
-Article E: M. Gil, J. Bonache, J. Selga, J. García-García, F. Martín, "Broadband resonant type metamaterial transmission lines ", IEEE Microwave and Wireless Components Letters, vol. 17, pp. 97-99, 2007. -Article F: M. Gil, J. Bonache, J. García-García, J. Martel and F. Martín, "Composite Right/Left-Handed Metamaterial Transmission Lines Based on Complementary Split-Rings Resonators and Their Applications to Very Wideband and Compact Filter Design", IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 6, pp. 1296-1304, 2007. -Article G: M. Gil, J. Bonache, F. Martín, "Metamaterial Filters with Attenuation Poles in the Pass Band for Ultra Wide Band Applications", Microwave and Optical Technology Letters, Vol. 49, Issue 12, pp 2909-2913, 2007. -Article H : M. Gil, J. Bonache, J. García-García and F. Martín, "New Left Handed Microstrip Lines With Complementary Split Rings Resonators (CSRRs) Etched in the Signal Strip", IEEE MTT-S Int'l Microwave Symposium Digest, Honolulu (HA), USA, pp. 1419-1422, 2007. -Article I: M. Gil, J. Bonache and F. Martín, "Synthesis and applications of new left handed microstrip lines with complementary split-ring resonators etched on the signal strip", IET Microwaves, Antennas & Propagation, Vol. 2, Issue 4, pp. 324-330, 2008. -Article J: J. Bonache, M. Gil, O. García-Abad and F. Martín, "Parametric analysis of microstrip lines loaded with complementary split ring resonators", Microwave and Optical Technology Letters, Vol. 50 , Issue 8, pp. 2093-2096, 2008. -Article K*: M. Gil, J. Bonache, F. Martín. "Ultra Compact Band Pass Filters Implemented Through Complementary Spiral Resonators (CSRs)", IEEE MTT-S Int'l Microwave Symposium Digest, Atlanta, USA, pp.323-326, 2008. -Article L: M. Gil, J. Bonache, and F. Martín, "Metamaterial filters: A review", Metamaterials, vol. 2, pp. 186-197, 2008. -Article M*: M. Gil, C. Damm, A. Giere, M. Sazegar, J. Bonache, R. Jakoby, F. Martín. "Electrically Tunable SRRs at Microwave frequencies based on BST thick films". Electronic Letters (submitted).
Recent advances have made possible the emergence of a new kind of materials: Metamaterials. In just some years, the development of this new scientific branch has given rise to numerous discoveries and technological advances based on the new properties shown by these novel materials. The present Thesis gathers a part of the work developed during the last years in the Group GEMMA and CIMITEC in the application of resonant-type metamaterial transmission lines to the development of microwave devices. The small size and the controllability of the electrical characteristics of metamaterial transmission lines based on sub-wavelength resonators are the main properties that make possible their use in the synthesis of microwave devices with compact dimensions and exceptional features. Microwave components based on metamaterial transmission lines are, therefore, of special interest in those applications in which compactness is a critical aspect. However, besides their small size, such devices can also offer a performance improvement or even new functionalities. This document has been written as a compendium of 13 articles. The articles contain most of the results of the work developed during the realisation of this Thesis and are included in a complete list given below. The document has been divided in several sections devoted to different aspects: -The second chapter presents a brief introduction about Metamaterials and left-handed materials, including their properties and constituent elements. Special attention is paid to the application of such concepts to planar structures and the synthesis of metamaterial transmission lines. -The third chapter delves into the implementation of metamaterial transmission lines by means of the resonant approach, which is applied in this work. Different kinds of resonant-type metamaterial transmission lines are presented and studied, with special emphasis on those structures which have been employed in the devices presented in chapter 4. -The fourth chapter is devoted to the applications of the previously studied structures to the design of specific components, including different kinds of power dividers, narrow- and broad-band filters and reconfigurable structures based on ferroelectric materials. -Finally, the fifth chapter includes some conclusions and possible next goals are exposed.
ARTICLES: Due to regulation reasons, the articles marked with * cannot be considered as a basic part of this Thesis, either for being Conference, but not Journal Articles, or for being pending acceptance by the time of the Thesis submission. -Article A: M. Gil, J. Bonache, I. Gil, J. García-García and F. Martín, "On the transmission properties of left handed microstrip lines implemented by complementary split rings resonators", Int. Journal Numerical Modelling: Electronic Networks, Devices and Fields, vol. 19, pp 87-103, 2006. -Article B: M. Gil, J. Bonache, I. Gil, J. García-García and F. Martín, "Miniaturization of planar microwave circuits by using resonant-type left handed transmission lines", IET Microwave Antennas and Propagation, Vol.1, pp. 73-79, 2007. -Article C: M. Gil, I. Gil, J. Bonache, J. García-García and F. Martín, "Metamaterial transmission lines with extreme impedance values", Microwave and Optical Technology Letters, vol. 48, pp. 2499-2505, 2006. -Article D*: M. Gil, J. Bonache, I. Gil, J. García-García and F. Martín, "Artificial Left¬handed Transmission Lines for Small Size Microwave Components: Application to Power Dividers", presented at 36th European Microwave Conference (EuMC), Manchester (UK), pp. 1135-1138, 2006.
-Article E: M. Gil, J. Bonache, J. Selga, J. García-García, F. Martín, "Broadband resonant type metamaterial transmission lines ", IEEE Microwave and Wireless Components Letters, vol. 17, pp. 97-99, 2007. -Article F: M. Gil, J. Bonache, J. García-García, J. Martel and F. Martín, "Composite Right/Left-Handed Metamaterial Transmission Lines Based on Complementary Split-Rings Resonators and Their Applications to Very Wideband and Compact Filter Design", IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 6, pp. 1296-1304, 2007. -Article G: M. Gil, J. Bonache, F. Martín, "Metamaterial Filters with Attenuation Poles in the Pass Band for Ultra Wide Band Applications", Microwave and Optical Technology Letters, Vol. 49, Issue 12, pp 2909-2913, 2007. -Article H : M. Gil, J. Bonache, J. García-García and F. Martín, "New Left Handed Microstrip Lines With Complementary Split Rings Resonators (CSRRs) Etched in the Signal Strip", IEEE MTT-S Int'l Microwave Symposium Digest, Honolulu (HA), USA, pp. 1419-1422, 2007. -Article I: M. Gil, J. Bonache and F. Martín, "Synthesis and applications of new left handed microstrip lines with complementary split-ring resonators etched on the signal strip", IET Microwaves, Antennas & Propagation, Vol. 2, Issue 4, pp. 324-330, 2008. -Article J: J. Bonache, M. Gil, O. García-Abad and F. Martín, "Parametric analysis of microstrip lines loaded with complementary split ring resonators", Microwave and Optical Technology Letters, Vol. 50 , Issue 8, pp. 2093-2096, 2008. -Article K*: M. Gil, J. Bonache, F. Martín. "Ultra Compact Band Pass Filters Implemented Through Complementary Spiral Resonators (CSRs)", IEEE MTT-S Int'l Microwave Symposium Digest, Atlanta, USA, pp.323-326, 2008. -Article L: M. Gil, J. Bonache, and F. Martín, "Metamaterial filters: A review", Metamaterials, vol. 2, pp. 186-197, 2008. -Article M*: M. Gil, C. Damm, A. Giere, M. Sazegar, J. Bonache, R. Jakoby, F. Martín. "Electrically Tunable SRRs at Microwave frequencies based on BST thick films". Electronic Letters (submitted).

In this thesis, an integrated monitoring device for use on 11 kV overhead lines has been developed. Uniquely, the devices use an optimised form of Power Line Communication to enable a low latency communication network. It is shown that such a network is able to facilitate new and improved applications and offer tangible benefits to the network operator.

Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Tentzeris, Emmanouil; Committee Member: Andrew Peterson; Committee Member: Laskar, Joy; Committee Member: Papapolymerou, Ioannis. Part of the SMARTech Electronic Thesis and Dissertation Collection.

In this report the analysis of microstrip electrodynamic structures on basis of high-temperature superconductors is carried out and a mathematical model of microstrip devices with lumped and distributed nonlinear properties is created. For this purpose nonlinear integral equations method and method of moments are used. In the issue of the work a SHF filter based on the equivalent circuit of elements with lumped parameters is also studied. It is ascertained that the received mathematical model allows to achieve more proper results of modeling on compensation of variation of current-density distribution nearby the edges of conductor break.

La commande optique de dispositifs microondes, qui exploite l'injection optique des porteurs dans un semiconducteur, apporte de nombreux avantages vis-a-vis de l'electronique conventionnelle. La presente etude avait pour objectif d'etendre cette commande a des dispositifs, realisant des fonctions complexes, tels que les attenuateurs, resonateurs et filtres microondes. Les structures etudiees ont ete realisees sur du silicium en technologie ligne microruban. Nous avons exploite principalement la charge complexe induite entre le ruban et le plan de masse par illumination optique. Nous avons demontre que la lumiere cree principalement une charge resistive aux faibles puissances, mais qu'une composante reactive apparait aussi d'une maniere nette pour les puissances optiques elevees. L'effet resistif a ete mis en application dans la realisation d'un attenuateur microondes en technologie microruban, reglable par la simple commande optique. Nous avons demontre sur un premier prototype une plage d'attenuation superieure a 10db dans la bande c. Quant a l'effet reactif, nous avons introduit une commande supplementaire qui permet de le renforcer. Il s'agit de polariser le plasma photo-induit par une tension continue qui se superpose au signal hyperfrequences. Nous avons accorde la frequence de differents resonateurs par cette nouvelle double commande optoelectronique. Ces accords, sont, a notre connaissance, de loin les plus larges jamais reportes parmi les accords electriques. En effet, nous avons mesure des deplacements de la frequence de resonance de l'ordre de 30% en dessous de la frequence de resonance en l'absence d'illumination. L'etude est plutot de nature experimentale, mais des modeles theoriques simples ont ete developpes pour tenter d'expliquer les differents phenomenes nouveaux mis en evidence experimentalement. Nous avons reussi a etablir, d'une maniere satisfaisante en premiere approche, le lien entre les parametres physiques du semiconducteur d'une part et le schema equivalent du plasma photo-induit deduit de la reponse microondes du dispositif d'autre part

Disertacijoje nagrinėjamos mikrobangų įtaisų analizės ir sintezės proble-mos, taikant lygiagrečiąsias kompiuterines sistemas. Pagrindiniai tyrimo objektai yra daugialaidės mikrojuostelinės linijos ir meandrinės mikrojuostelinės vėlinimo linijos. Šie objektai leidžia perduoti, sinchronizuoti bei vėlinti siunčiamus signalus ir yra neatsiejama dalis daugelio mikrobangų prietaisų. Jų operatyvi ir tiksli analizė bei sintezė sąlygoja įtaisų kūrimo spartinimą. Pagrindinis disertacijos tikslas – sukurti lygiagrečiąsias metodikas ir algoritmus, skirtus sparčiai ir tiksliai atlikti minėtų linijų analizę ir sintezę. Sukurtų algoritmų ir metodikų taikymo sritis – mikrobangų įtaisų modeliavimo ir automatizuoto projektavimo progra-minė įranga.
An analysis using numerical methods can calculate electrical and construction characteristics parameters of microwave devices quite accurately. However, numerical methods require a lot of computation resources and time for calculations to be made. Rapid perfection of the computer technologies and software with implementation of the numerical methods has laid down the conditions to the rapid design of the microwave devices using computers.

Disertacijoje sprendžiama lėtinimo sistemų kraštinių ir galinių laidininkų įtakos modelių tikslumui įvertinimo problema. Pagrindiniai tyrimo objektai – daugialaidžių ir meandrinių mikrojuostelinių linijų matematiniai modeliai, skaitiniai analizės metodai. Darbo tikslas – sukūrus modelius, grįstus baigtinių skirtumų laiko srities metodu, ištirti galinių ir kraštinių laidininkų netolygumų įtaką meandrinių mikrojuostelinių vėlinimo linijų laiko ir dažninėms charakteristikoms, pasiūlyti meandrinių vėlinimo linijų konstrukcijų tobulinimo priemones. Darbe sprendžiami uždaviniai: matematinių pavienės, susietųjų ir daugialaidžių mikrojuostelinių linijų modelių sudarymas ir savybių tyrimas, taikant baigtinių skirtumų bei baigtinių skirtumų laiko srities analizės metodus; daugialaidžių mikrojuostelinių linijų sintezės ir meandrinių mikrojuostelinių vėlinimo linijų analizės algoritmų bei jų elektrinių charakteristikų skaičiavimo metodikų sudarymas. Disertaciją sudaro įvadas, keturi skyriai, bendrosios išvados, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašai. Įvadiniame skyriuje formuluojama tiriamoji problema, aptariamas darbo aktualumas, aprašomas tyrimų objektas, formuluojamas darbo tikslas bei uždaviniai, aprašoma tyrimų metodika, darbo mokslinis naujumas, rezultatų praktinė reikšmė, ginamieji teiginiai. Įvado pabaigoje pristatomi pranešimai konferencijose disertacijos tema bei pateikiama disertacijos struktūra. Pirmajame skyriuje pateikiama literatūros... [toliau žr. visą tekstą]
There are investigated accuracy issues of edges and ends evaluation problems of meander slow-wave systems in the dissertation. Objects of research – mathematical models of multiconductor and meander microstrip delay lines, numerical analysis methods. Aim of the work – after creating mathematical models, based on finite difference time domain method, explore ends and edges discontinuity effects on meander microstrip delay lines time and frequency characteristics, propose structural improvement measures of meander delay line. The dissertation approaches major tasks such as: mathematical individual, coupled, multiconductor microstrip lines models composition for performance and their properties investigation using finite difference and finite difference time domain methods of analysis; synthesis algorithm of multiconductor microstrip lines and analysis algorithm of meander microstrip delay line and methodology of their electrical characteristics calculation creation. The thesis consists of four parts including introduction, 4 chapters, conclusions, references. The introduction reveals investigated problem, importance of the thesis and object of research. It also describes the purpose and tasks of the dissertation, research methodology, scientific novelty and the practical significance of results examined in the thesis and defended statements. The introduction ends in presenting the author’s publications on the subject of the defended dissertation, offering the material of made... [to full text]

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.

In the analysis of optically controlled microstrip interdigitated gaps, an equivalent circuit model for simple interdigitated gap is obtained. As far as we know, this is the first report of optically controlled microstrip interdigitated gap equivalent circuit model. The amplitude and phase changes of interdigitated gaps under different illumination powers are calculated with this equivalent circuit model, which basically agree with the experimental results. Meanwhile, the effect on the transmission characteristics from the gap dimensions is also discussed. Finally a novel gap structure is described for optically controlled phase shifter application, whose transmission characteristics have nearly zero amplitude change and no less than 27 degrees phase change under different illumination powers when the transmission signal frequency is about 1.8 to 2.5GHz. Some detailed experimental results of this gap are presented in Chapter 5.
In this dissertation, a systematic work has been done to analyze the transmission characteristics and applications of optically controlled microstrip single gap and interdigitated gap devices on high resistivity silicon (HRS) wafer. Detailed simulations, experiments and the relative equivalent circuit models for these gap structures are presented.
Microwave photonics is a multi-disciplinary area that studies the interactions between microwave signals and optical signals. As one of the key elements, direct optical control of microwave semiconductor devices has been an area of growing interest since 1980's. They can be widely used in picosecond photoconductive switch, phase shifter, attenuator, high-speed sampling, gain control of amplifier and so on.
Some future work is also suggested based on the study in this dissertation.
Specifically, optically controlled microstrip discontinuities devices fabricated on semiconductor substrates have wide-ranging applications due to their simple fabrication, easy integration with other passive and active microwave devices.
When illuminated on the surface of the microstrip single gaps, the S 12 amplitude of this gap increases linearly as the optical illumination increasing, which is a good potential application for digital controllable attenuator. The change of the S12 amplitude is mainly due to the imaginary permittivity change of the HRS substrates. The equivalent circuit model is established to explain the amplitude and phase changed. The equivalent resistors have been calculated according to the excess carrier concentration profile after illumination, which match well with the experimental results.
Li Huiping.
"March 2005."
Adviser: K. T. Chan.
Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6619.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2005.
Includes bibliographical references.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts in English and Chinese.
School code: 1307.

碩士
中華大學
電機工程學系碩士班
103
In this study, we created a new structure as a couple circuits in the differential micro-strip line, which on differential line both sides or single side engraved with different periodic pattern to see whether this structure can effectively transmit surface plasmon polariton (SPPs). The trapping pair has entirely different and complementary for signal transmission, in herein, we simulated the frequency range from 200MHz to 10GHz by numerical analysis to discuss the structure effect for transmission bandwidth, color dispersion and attenuation constant. Finally, together with a conventional microstrip line simulation S parameters section, it can be learned from the simulation results, this special structure can transmit low frequency surface polaron, showing the ability to more effectively restrain the electromagnetic field,therefore can inhibit disturbance between micro-strip line, furthermore, can significantly reduce the differential signaling common mode effects because transmission line is too close so can more effectively in enhancing the Integration level of speed circuits and microwave circuit.

碩士
國立臺灣科技大學
工程技術研究所
81
A new quasistatic and fullwave analysis of microstrip line structures with multidielectric layers is presented,using a hybrid approach that combined the finite-element method and the conformal-mapping technique. In this hybrid approach,the Wheeler's mapping function is firstly adopted to transform the half-infinite original domain into a finite image domain and to overcome both the problems of infinite field extension and the field singularity difficuty around the conductor edges.Then,the integral formula for the quasistatic analysis is derivved from the Laplace's equation in a way similar to that of weighted residual method in the finite-element analysis,while the variational formula for the fullwave analysis is derived from the Maxwell equation and then obtained from variational reaction theory. In the final part of this approach,numerical results for effective dielectric constants,characteristic impedances,charge distributions,current distributions and dispersion conditions for various multilayer microstrip lines structures are presented and discussed. Comparsions of the present results with the available quasistatic and fullwave ones are made,and good agreements are obtained.

碩士
國立彰化師範大學
工業教育學系
85
The objective of this research is to apply a full-wave rigorous integralequation method for the analysis of superstrate-loaded cylindrical microstriptransmission lines.The approach started with Maxwell's equations,considering the effects of all appropriate boundary conditions,and then evaluated theGreen's function for the system of interest.The integral equation for the analysis expresses the unknown electric field in a convolution form of the microstrip current and the Green's function for the cylindrically layeredmicrostrip structure. Effects of boundary conditions on the behavior of the fields incorporated in their full generality in the Green's function. For numerical computation of the effective propagation constant and other quantities,we follow Galerkin's method of moments. The trigonometric functions incorporated appropriate edge conditions are used for current expansion and testing. In this thesis,we have completed some computation work. The effectivepropagation constants of the fundamental mode and the first higher-order modeand the characteristic impedance under the variation of the structure parameters will be presented.Results obtained from this work were compared to other researcher's work available in the literature,and good agreement was observed.

碩士
長庚大學
電子工程學系
99
The purpose of this dissertation is to explore the theory and application of periodically loaded microstrip coupled lines. By adding periodic loads on a parallel coupled line, Bloch wave modes can be generated. The characteristic impedances and propagation constants can be derived by applying even-odd analysis to the structure. We found that codirectional, contradirectional and trans-directional couplers, the three common types, can be realized. Compared to conventional microstrip parallel couplers, this new structure can provide higher coupling factors and reduce the length of the coupler. These three kinds of couplers are designed and fabricated to operate at 2.4 GHz with coupling factor 3-dB. The measured fractional bandwidths are 15%, 2.1% and 26.25%, respectively. The measured insertion losses are 4 dB、4.15 dB and 3.38 dB. A planar crossover is also realized by a 0-dB codirecitional coupler with measured bandwidth and insertion loss 24.2% and 1.32 dB, respectively. All these measured results are in good agreement with simulated results, proving our concept and theory.

碩士
國立海洋大學
電子工程學系
82
The purpose of this thesis is to study the dispersive characteristics of microstrip lines. Firstly, the microstrip structure and its relative quasi-static characteristics are discussed, and the existed dispersion models are also compared. Secondly, the frequency-dependent characteristics of microstrip lines are analyzed, including normalized phase constant, characteristic impedance, and losses etc. From the results of numerical analysis, it is noted that all the waveguiding parameters of microstrip lines are increased with the frequency. Finally, under the consideration of conductor and dielectric losses, the time-domain analysis of microstrip dispersion is executed. From the results of numerical analysis, it is noted that the dispersion effect will be more pronounced when the microstrip lines are designed with larger aspect ratio or substrate dielectric constant, and thicker strip conductor or substrate.

博士
國立中山大學
電機工程研究所
84
The characteristics of single microstrip line or coupled microstrip lines on a cylindrical substrate are rigorously studied. For the single microstrip line study, theoretical and experimental investigations on a wide cylindrical microstrip line are conducted. The theoretical treatment using a full-wave analysis incorporating with the exact Green''s function in the spectral domain is applied. And moment-method calculation is used to obtain the frequency-dependent numerical results of the relative permittivity and characteristic impedance. From the comparison of the calculated results and the measured data, the contribution of the transverse current component to the characteristics of a cylindrical microstrip line is analyzed. A rigorous full-wave analysis of cylindrical microstrip open-end and gap discontinuities is also presented. The electric currents on the microstrip line are expanded in terms of entire- domain sinusoidal and piecewise sinusoidal basis functions. The entire-domain sinusoidal modes represent incident, reflected, and, for the gap, transmitted waves away from the discontinuity; the piecewise sinusoidal modes are used in the vicinity of the discontinuities. For the open-end case, results for the frequency-dependent reflection coefficient and the equivalent terminal conductance and capacitance at the discontinuity are presented. For the gap case, the frequency- dependent reflection and transmission coefficients and the gap capacitance and conductance are presented. The characteristics of cylindrical microstrip open-end and gap discontinuities for various curvatures are analyzed.

碩士
國立臺北科技大學
光電技術研究所
90
This thesis borrowed Mr. Denlinger ‘s Integral equation of the analysis frequency dependent solution for microstrip line，and use different basis functions to work with(only consider the longitudinal current and also consider about the longitudinal current and transverse current ) and numerical method，calculate the relationship between the effective dielectric constant of microstrip line and parameter related : ( 1 ) Discuss the relationship between integral function position and behavior. ( 2 ) Discuss the relationship between frequency and effective dielectric constant. ( 3 ) Discuss the thickness of substrate. ( 4 ) Discuss the w/d ratio of substrate.

碩士
國立成功大學
電機工程研究所
83
One of the main requirements for a transmission structure to be suitable as a circuit element in microwave integrated circuits( MICs) is that the structure should be planar in configuration.A planar configuration implies that the characteristics of the element can be determined by the dimensions in a single plane. Microstrip line is the most popular transmission line structure that satisfies the requirement of being planar.Ease of fabrication by photolithographic techniques and a good range of impedances and couplings allow it to be used for a wide variety of circuit components.Also, simple transitions to coaxial circuits are feasible.For frequency up to 26 GHz,99.6% alumina substrate (dielectric constant=9.8)has been used by many designers.At higher frequency above 26 GHz,fabrication difficulty becomes significant due to the shorter effective wavelength, which results in the smaller size of the circuit. Since the effective wavelength(and hence the group velocity) is inverse proportional to the square root of the effective dielectric constant,which is closely related to the dielectric constant,a new substrate with lower dielectric constant will solve the problem.Futhermore, the group velocity will also increase when the dielectric constant is reduced. In this work, the cordierite sol-gel glass ceramic powder was used to construct the substrate(dielectric constant : 5-6@1KHz). Basic properties of microstrip lines on cordierite substrate were examined.A comparison to those in alumina substrate is also given. Experiments show that the cordierite substrates have good performance and are suitable for millimetre-wave microstrip designs.

碩士
國立交通大學
電信研究所
85
In the thesis, we present a method for the design and synthesis of double and triple coupled nonuniform microstrip lines. The method is originated from an electrical lengthmatched procedure for single nonuniform microstrip line. The system performances we considered are bandwidth and ripple peak of scattering parameter S11, so the Tchebtcheffresponse is adopted as the initial response for our design. Using the electrical lengthmatched procedure double or triple coupled nonuniform microstrip lines with smaller reflection can be synthesized. The reduction of ripple peak and the increase of bandwidthare impossible to obtain at the mean time and there must be a tradeoff between them.According to the system demands, the designer may adjust the parameters such as tolerable reflection coefficient and cutoff angular frequency for each mode so that desired performance can be achieved.

碩士
國立彰化師範大學
工業教育學系
85
A full-wave spectral-domain integral equation method is employed to analyze the asymmetric gap discontinuities in both outside and inside microstrip lines affixed to the top of a cylindrical grounded substrate. The system integral equation expresses the electric field in terms of the microstrip current integrated into a dyadic Green's function; boundary conditions are incorporated in their full generality in the Green's function. The approach addressed in this work takes into account all the physical effects, including the radiation and surface waves excited in the vicinity of the gap discontinuity. For numerical solution, a Galerkin's method of moments using a combination of entire domain traveling-wave modes and piecewise sinusoidal (PWS) basis functions to represent the unknown strip current is implemented. The characteristics of the frequency- dependent S-parameters, power losses, and the pi-model equivalent circuits for several typical gap structures are investigated. The effects of the superstrate and radius curvature on the behavior of the asymmetric gap discontinuities in cylindrical microstrip lines are also studied.

碩士
國立海洋大學
電機工程學系
85
The purpose of the thesis is to study the dispersion characteristics of shield ed coupled microstrip lines. Firstly, The shielded coupled microstrip line structures and the exicted dispersion models are introduced in detail. Secondly, The quasis-static characteristics of shielded coupled microstrip lines are analyzed. Moreover, the frequency- dependentcharacteristics of the shielded coupled microstrip lines are studied, including the even- and odd-mode effective dielectric constantsand characteristic impedences. From the results of analysis, it is noted that the even- and odd-mode effective dielectric constantsand characteristics impedences are increased with the frequency. Finally, the signal dispersion on shielded on shielded coupled microstrip linesis executed. From the results of analysis, it is noted that the dispersion effect will be more pronounced when the shielded coupled microstrip lines are designed with largersubstrate dielectric constant or strip conductor width, thicker strip conductor or substrate and higher shielding height or strip conductors.

Thesis (M.S.)--Michigan State University. Dept. of Electrical and Computer Engineering, 2008.
"Advisor, Dr. Leo Kempel"--Acknowledgments. Title from PDF t.p. (viewed on Aug. 5, 2009) Includes bibliographical references (p. 167-168). Also issued in print.

The main subject of this work is the modular design of multilayer printed arrays. The need for a multilayer feeding network is evident in large arrays with a large number of power dividers or phase shifters. Due to space considerations the spurious coupling between the network and the radiating elements, or between different parts of the network itself, can be significant enough to degrade performance. In addition, corporate feed network radiation can affect the sidelobe and cross-polarization characteristics of the array. The use of a multilayer feed network located in a different plane than the radiating elements can alleviate these problems. The transfer of power between two adjacent layers in a multilayer structure can be done using either a pin which makes an electrical contact, or via coupling apertures in the ground plane separating the layers. Beyond the advantages of fabrication, aperture coupling leads to inherently symmetric feed network layouts which further simplify the design. The Green's functions for multilayer dielectric substrates can be used to compute the characteristic impedance of any printed planar transmission line and the full-wave analysis of an entire multilayer network can be obtained. In the past, full-wave solutions were derived for different configurations involving the coupling from one layer to another by means of a rectangular slot. The number of possible configurations is quite limited, since in a typical planar multi layer structure there may be only two microstrip layers (the outermost layers), while the inner layers are typically stripline. This leaves two types of aperture coupling transitions: microstrip to stripline and stripline to stripline. Assuming that the coupling between separate apertures and the coupling between patches is negligible, having a model for each of these two transitions is enough to analyze and design the whole multilayer structure. The radiating elements can also be fed by aperture coupling, and a separate analysis has to be performed for each configuration. Furthermore, the radiating element layer can be placed in a plane perpendicular to the feeding network. The theory used in the modeling of different transitions will be presented first. The reciprocity technique first developed in (9) and further extended in (10) proves to be computationally efficient and gives good results for these cases. The models for individual transitions are validated by measurements and subsequently used in the design of a number of prototype multilayer planar arrays.

碩士
中華大學
電機工程學系碩士班
98
In this thesis, we developed a new kind of microstrip line on which the spoof surface plasmon polaritons (SPPs) can propagate in the low frequency (such as microwave or terahertz regime). The metal strip is designed by introducing periodical subwavelength structure on the edge of conventional microstrip line. Numerical methods are used to analyze the dispersion relation, asymptotic frequency, attenuation coefficient and surface current distribution. Such periodically structured microstrip lines support spoof SPPs in the frequency range between 200MHz and 8GHz are verified. Compared with the quasi-TEM modes on conventional metal strip lines, the spoof SPPs can be highly localized on the surface of the structured microstrip lines, so the crosstalk between different structured microstrip lines is very weak. Therefore this new kind of periodically structured microstrip line will be of great use in the high density microwave circuits or high speed systems.

碩士
大同大學
通訊工程研究所
98
The electronic industry PCB circuit design of product . The conventional signal-end transmission working on low speed in design engineer knowledge. The differential transmission line used in circuit is very popular application. The Advantages of differential transmission line are of fast transmission speed , immunity against electromagnetic interference, But the drawback is necessary to support 2 symmetry characteristic transmission line need same impedance and equalize propagation delay, the differential signal will not distortion and function down. But electronic industry product and PCB size is very small of specification for cost down . A lots component will mounting on PCB. It will reduce differential transmission space and path to straight connect with component or chip input . How to meet and support 2 symmetry characteristic transmission line need same impedance and equalize propagation delay . In this thesis we will find out solution. The object of this thesis is to propose a method for compensate as un-desired phase delay cause by unequal-length differential transmission lines. The propagation delay of a bend of differential transmission lines can be improved by disposing structure to the unequal length differential transmission lines. In this thesis release method is added transmission line into bend of transmission line two side . It will coupling two line and cause inductor and capacitor effect of lump circuit structure to improved unequal length differential transmission propagation delay problem. We use CST simulation software to simulate 90° find propagation delay problem and try to find some technique of solution to solve problem. Than use TDR to extract lump element into AWR program from bend of differential transmission line fixture and added line into bend of differential transmission line fixture also AWR program simulation time delay of result . Finally we use oscilloscope to measurement all fixture and compare with simulation data. We are not consider UC-PBG and Meander line additional method because complex structure and high cost issue not good for electronic industry product usable.

碩士
國立彰化師範大學
工業教育研究所
81
This thesis presents a full-wave, spectral domain technique for the analysis of leakage problem of coupled microstrip transmission lines. The problem is formulated with an electric field integral equation (EFIE) method which is based on a field equivalence principle and the identification of equivalent current induced on the microstrip device surface. The EFIE expresses the electric field in terms of the device current integrated into an electric Green''s function;boundary condition are incorporated in their full generality in the Green''s function. For validation of this approach, the general coupled integral equations are specialized to the case of two identical axially-uniform microstrips. An entire-domain basis method of moments (MoM) is implemented for numerical solution in both lossless and leaky regimes. current distributions for the first three higher-order coupled modes will be presented. Results from this research will serve as valuable reference for the design of novel coupled microstrip devices and for future study in this area.