Dissertations / Theses on the topic 'Olding of the resonator'
To see the other types of publications on this topic, follow the link: Olding of the resonator.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Olding of the resonator.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Браге, Ксенія Сергіївна. "Метод вимірювання НВЧ- параметрів матеріалів на основі тонкого діелектричного резонатора." Master's thesis, Київ, 2018. https://ela.kpi.ua/handle/123456789/22979.
Full textAbstract:
В даній роботі розглянуто питання загальних теоретичних відомостей з складених та тонких діелектричних резонаторів та методів вимірювання вимірювання НВЧ параметрів діелектричних матеріалів. Досліджено метод тонкого діелектричного резонатора та наведено результати експерементальних досліджень. При досліджені тонких діелектричних плівок виникають труднощі, тому що методи не забезпечують достатньої точності. При дослідженні метода тонких плівок результати показали, що при зменшенні товщини базового резонатора, збільшується точність. Тому метою роботи є адаптація методу складеного діелектричного резонатора для вимірювання параметрів тонких плівок.
Для досягнення поставленої мети необхідно було вирішити наступні задачі:
1. Проаналізувати існуючи методи вимірюваняя НВЧ – параметрів діелектричних матеріалів.
2. Проаналізувати властивості тонкого діелектричного резонатора (ТДР).
3. Запропонувати метод дослідження параметрів тонких плівок на основі ТДР.
4. Експерементально перевірити метод тонких плівок на основі ТДР.
Предметом і об’єктом даної робот є:
Об’єкт: тонкий діелектричний резонатор
Предмет: електродинамічні властивості тонкого діелектриного резонатора
Наукова новизна:
Теоретичне та експериментальне дослідження електро-динамічних властивостей ТДР показує, що на основі ТДР можна з достатньою точністю вимірювати НВЧ – властивості тонких діелектричних плівок.In the given work, the nutritional pockets of the teoretical publications are stored in those thin dielectric resonators and the method of determining the NVH parameters in the power electronics. The method of a thin dielectric resonator is applied to the result of the experimental data. When study slim dielectric films arise difficulties, to that method do not gave accuracy. When the method of thin plots is used, the results have been shown, when the basic resonator is changed, the accuracy is determined. To the method of robotics is adaptation to the method of the stored dielectric resonator for the parameterization of thin cells. For achivment it's delivered goal it was necessary to solve the problem: 1. Analyze existing methods 2. Analyze power of a thin dielectric resonator (TDR). 3.Propose method of study parameters in the small films on the basis of the TDR. 4. Experimentally check method of thin plvok on the basis of the TDR. The subject і objective of this work is: Ob'ekt: thin dielectric resonator Subject: Electrodynamic power of a thin dielectric resonator Science novelty: Theoretically, this experiment is complementary to the electric-dynamical authorities of the TDR, but on the basis of the TDR, it is possible to obtain the accuracy of the NVCH - the power of subtle electrical add-ons.
2
Tancredi, Giovanna. "Superconducting tunable resonator." Thesis, Royal Holloway, University of London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.530801.
Full text
3
Maas, Susan. "Coaxial resonator filters." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18067.
Full textAbstract:
Thesis (MScEng)--Stellenbosch University, 2011.ENGLISH ABSTRACT: The purpose of this project is to develop a number of coaxial resonator lters. Firstly, the theoretical model of the lter is discussed, with a Tchebyscheff LC-ladder prototype lter used to derive a generalised bandpass lter. From this, generalised Combline- and Interdigital lters are derived. Following this, various options and limitations in the mechanics of microwave lters are discussed. Results are shown for an in-depth study considering the unloaded quality factor for thirteen di erent resonators. Each resonator is unique in the method of manufacturing, polishing, as well as plating. Utilizing the information obtained from the unloaded quality factor measurements, three coupled coaxial resonator lters, are designed for use in a radar system, namely a sixth order 2125 MHz Combline lter, a sixth order 9250 MHz Interdigital lter and a third order 9250 MHz Interdigital lter. Optimal results were obtained when both resonators and coupled transmission line lters were constructed from aluminium that was wire-cut and then silver electroplated.
AFRIKAANSE OPSOMMING: Die omvang van hierdie projek behels die ontwerp en bou van ko-aksiale resoneerder filters. Eerstens word die teoretiese modellering van die lters bespreek. 'n Tchebyscheff LC-leer prototipe filter word gebruik as basis vir 'n generiese banddeurlaat filter. Die banddeurlaat lter word gebruik om die afgeleide Kamlyn- en Interdigitale filter te de finieer. Hierna volg 'n bespreking aangaande die verskillende moontlikhede in die meganiese vervaardiging van mikrogolf filters. 'n Gedetailleerde studie word gedoen om die onbelaste kwaliteitsfaktore van 13 verskillende resoneerders te bepaal. Elkeen van hierdie resoneerders is uniek in die metode van vervaardiging, polering, asook die platering daarvan. Deur gebruik te maak van die resultate van die onbelaste kwaliteitsfaktore, word drie gekoppelde ko-aksiale resoneerder filters ontwikkel vir die gebruik in 'n radarstelsel, naamlik 'n sesde-orde 2125 MHz Kamlyn lter, 'n sesde orde 9250 MHz Interdigitale filter, asook 'n derde orde 9250 MHz Interdigitale filter. Die beste resultate was gevind toe beide resoneerders en gekoppelde ko-aksiale resoneerder filters vervaardig is uit aluminium wat gedraadsny en silwer geplateer is.
4
Desjardins, Jason. "Reconfigurable Dielectric Resonator Antennas." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19838.
Full textAbstract:
With the increasing demand for high performance communication networks and the proliferation of mobile devices, significant advances in antenna design are essential. In recent years the rising demands of the mobile wireless communication industry have forced antennas to have increased performance while being limited to an ever decreasing footprint. Such design constraints have forced antenna designers to consider frequency agile antennas so that their behavior can adapt with changing system requirements or environmental conditions. Frequency agile antennas used for mobile handset applications must also be inexpensive, robust, and make use of electronic switching with reasonable DC power consumption.
Previous works have addressed a number of these requirements but relatively little work has been performed on frequency agile dielectric resonator antennas (DRAs). The objective of this thesis is to investigate the use of DRAs for frequency reconfigurability. DRAs are an attractive option due to their compactness, very low losses leading to high radiation efficiencies (better than 95%) and fairly wide bandwidths compared to alternatives. DRA’s are also well suited for mobile communications since they can be placed on a ground plane and are by nature low gain antennas whose radiation patterns typically resemble those of short electric or magnetic dipoles.
One way to electronically reconfigure a DRA, in the sense of altering the frequency band over which the input reflection coefficient of the antenna is below some threshold, is to partially load one face of the DRA with a conducting surface. By altering the way in which this surface connects to the groundplane on which the DRA is mounted, the DRA can be reconfigured due to changes in its mode structure. This connection was first made using several conducting tabs which resulted in a tuning range of 69% while having poor cross polarization performance. In order to address the poor cross polarization performance a second conducting surface was placed on the opposing DRA wall. This technique significantly reduced the cross polarization levels while obtaining a tuning range of 83%. The dual-wall conductively loaded DRA was then extended to include a full electronic implementation using PIN diodes and varactor diodes in order to achieve discrete and continuous tuning respectively. The two techniques both achieved discrete tuning ranges of 95% while the varactor implementation also had a continuous tuning range of 59% while both maintaining an acceptable cross polarization level.
5
Sudjiwo. "Suspended substrate resonator design." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA243250.
Full textAbstract:
Thesis (M.S. in Systems Engineering (Electronic Warfare))--Naval Postgraduate School, December 1990.Thesis Advisor(s): Atwater, Harry A. Second Reader: Knorr, Jeffrey B. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Descriptor(s): Fourier Transformation, Models, Transmission Lines, Substrates, Dielectric Properties, Resonant Frequency, Length, Constants, Resonators, Circuits, Equations, Discontinuities, Capacitance, Dispersions, Wave Analyzers, Propagation DTIC Identifier(s): Circuit Analysis, Resonators, Galerkin Method, Theses. Author(s) subject terms: Spectral Domain Approach, Suspended Substrate Line, Fourier Transform,Resonant Frequency, Propagation Constant, Fringing Capacitance. Includes bibliographical references (p. 76-77). Also available in print.
6
Chan, Richard Kayip. "Dielectric resonator bandstop filters." Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/2742/.
Full textAbstract:
Dielectric resonators have been widely employed in wireless and satellite communication systems due to their inherently large Q allowing them to fashion low loss and narrow bandwidth filters. Recent progress has adopted these resonators in applications requiring low volume and mass for demanding specifications. The technology at present consists of an assortment of bandpass filters using dielectric resonators but there is little published material on bandstop filters employing such resonators. Bandstop filters are desirable to suppress frequencies at the front end of wireless communication systems. To meet future demands, it is imperative to reduce the costs of these filters in both volume and weight using dielectric resonators. This thesis presents compact mono-mode and dual-mode bandstop dielectric resonator structures. The former consists of a dielectric-loaded waveguide cavity filter that offers a miniaturised version to typical cavity dielectric resonator filters requiring high unloaded Qs. The niono-mode filter described is ideal for relaxed specifications requiring a lower Q resonator to replace common coaxial resonator filters. For applications requiring high bandwidth, this resonator is improved by coupling a dielectric ring resonator to a coaxial transmission line. A novel dual-mode bandstop resonator is developed taking advantage of the geometry of a cylindrical puck within a single shielded cavity to create two degenerate modes with equal resonant frequency, effectively replacing two mono-mode cavities. Miniaturisation is achieved by sitting the dielectric puck at the base of the cavity and correct phase separation between the orthogonal modes is produced from a curved uniform transmission line. The mode behaviour is observed in the physical realisations using a 3D FEM solver. Advanced filtering functions using prescribed reflection zeros is demonstrated with the simulation of a dual-cavity, dual-mode bandstop resonator where inter- and intra- cavity couplings are controlled. The miniaturisation techniques discussed in this thesis will provide cost-reduction for microwave communication systems requiring high- Q bandstop filters.
7
Steinmetz, Tilo. "Resonator-Quantenelektrodynamik auf einem Mikrofallenchip." Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-106545.
Full text
8
Zhou, Liang. "Low Noise Dielectric Resonator Oscillators." Thesis, University of York, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521161.
Full text
9
Chang, Cheng-Chun. "Coupled-waveguide Fabry-Perot resonator." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10062009-020056/.
Full text
10
Luhaib, Saad Wasmi Osman. "Multi-mode dielectric resonator filters." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20843/.
Full textAbstract:
Dielectric resonator (DR) filters are widely used in microwave communications due to their small size and high Q-factor. Multi-mode filters offer a further level of miniaturisation. A new multi-mode dielectric resonator filter is presented in this thesis. The TE11d dual-mode DR offers an 11% size reduction ratio compared with a coaxial air-filled filter with the same unloaded Q-factor (Qu) and about 820 MHz spurious separation from the fundamental frequency 1.95 GHz. Two coupling techniques are applied in the TE11d filter configuration. These are: ceramic puck/probe in contact and etching holes through the ceramic puck for probe installation. A 4th order Chebyshev filter dual-mode DR filter has been simulated and fabricated using each technique. The results show a good agreement between the simulation and measurement with half spurious-free window compared with non-loaded cavity. In the etching method, the spurious-free window and the Qu improved compared with unpatterned ceramic puck. The inline structure filter provides an extra improvement in the spurious window base for the planar configuration. Another approach to the dual-mode DR filter has been studied in this work. A HE11 dual-mode with ceramic puck placed at the base of the cavity presents a good size reduction ratio and acceptable spurious window. The mathematical model shows that transmission zeros (TZs) can be generated in all orientation cases of the inter-resonator coupling hole. The control range of the TZs positions was from 40 MHz from the centre frequency. A good agreement was obtained between the simulation and the measurement results. A triple-mode DR filter with two-piece of the ceramic puck in parallel has been presented. The one cavity approach offers a high Q-factor with 400 MHz suppression. A coaxial probe was used for the input/output coupling and the etching hole through the ceramic puck for inter-resonator coupling. A 3rd order Chebyshev DR filter was simulated and fabricated with two TZs on the upper sideband. The practical results show prospects in application of the filter for miniaturised microwave communications.
11
Wang, Siping S. M. Massachusetts Institute of Technology. "Gallium Nitride phononic crystal resonator." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99831.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 41-42).
We present a Gallium Nitride (GaN) Lamb Wave resonator using a Phononic Crystal (PnC) to selectively confine elastic vibrations with wide-band spurious mode suppression. A unique feature of the design demonstrated here is a folded PnC structure to relax energy confinement in the non-resonant dimension and to enable routing access of piezoelectric transducers inside the resonant cavity. This provides a clean spectrum over a wide frequency range and improves series resistance relative to transmission line or tethered resonators by allowing a low-impedance path for drive and sense electrodes. GaN resonators are demonstrated with wide-band suppression of spurious modes, f -Q product up to 3.06 x 1012, and resonator coupling coefficient k2.eff up to 0.23%. (filter BW up to 0.46%). Furthermore, these PnC GaN resonators exhibit record-breaking power handling, with IIP3 of +27.2dBm demonstrated at 993MHz.
by Siping Wang.
S.M.
12
Zarinetchi, Farhad. "Studies in optical resonator gyroscopes." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13227.
Full textAbstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.Includes bibliographical references (leaves 193-194).
by Farhad Zarinetchi.
Ph.D.
13
Talebi, Fard Sahba. "Optical resonator sensors and systems." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52834.
Full textAbstract:
Silicon-on-insulator (SOI)-based sensors are attractive for sensing applications in environmental safety, oil and gas, medical research, and clinical applications. Since these devices are typically developed using Complementary metal-oxide-semiconductor (CMOS)-compatible multi-project-wafer (MPW) shuttles, they bring the potential for having sensing systems on chips (SSOCs), and for mass fabrication and low cost production. The objective of this thesis is to improve the sensitivity, accuracy, and repeatability of sensors fabricated on the SOI platform. Such sensors have the potential to be the key components of an SSOC.
One can increase the sensitivity of a resonator sensor by increasing the interaction between the evanescent field of the guided mode and the analyte. In this thesis, two methods for increasing this interaction in micro-ring resonator-based sensors are investigated: 1) using the transverse electric (TE) guided mode in ultra-thin strip waveguides and 2) using the quasi-transverse magnetic (TM) guided mode in thin strip waveguides. Using analyses and simulations, micro-ring sensors were designed to be fabricated within the constraints of a MPW CMOS-compatible process. Using the TE sensors, the temperature-induced errors were reduced by a factor of three; and the TM sensors exhibited twice the sensitivity of the best SOI micro-ring resonator-based sensors reported to date.
Moving towards the actual implementation of an SSOC, a system of sensors was design to correct for unwanted variations in the measurements. This system drew on multivariate techniques to achieve improvements that resulted in measurements that were more repeatable and more accurate in the presence of environmental variations. The capability of this system is investigated by designing a cascade of previously developed micro-ring sensors with various waveguide thicknesses. With this system of sensors, we achieved an R2 value of predictions over 0.996 in the presence of a 2 K temperature drift. This approach significantly improved the repeatability and reliability of the measurements in the presence of undesirable variations and drifts. In another move towards achieving an SSOC, integrating photodetectors in resonator sensors was investigated. To accomplish this, ion-implantation on micro-ring sensors was used. Such integrated photodetector-sensors were designed, fabricated, and tested. Their measured sensitivities were within 90% of the expected values.Applied Science, Faculty of
Graduate
14
Guthoehrlein, Gerhard Robert. "Einzelne Kalziumionen in einem optischen Resonator." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-3075.
Full text
15
Boeck, Robert. "Silicon ring resonator add-drop multiplexers." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37779.
Full textAbstract:
Wavelength-division multiplexing (WDM) using silicon-on-insulator (SOI) waveguides have become an attractive area of research to decrease the footprint of optical interconnects as well as to ensure high speed data transmission. Specifically, research into using SOI ring resonator add-drop filters for WDM applications have been increasingly pursued. A ring resonator coupled on both sides by straight waveguides enables one to add (multiplex) or drop (demultiplex) wavelengths. Using series-coupled ring resonators, with each resonator having a different length, enables better spectral performance than single ring resonators. In this thesis, we have analyzed the properties of SOI strip waveguides and directional couplers. We have compared different spectral properties of single and series-coupled ring resonators and showed the advantages of using series-coupled ring resonators. SOI strip waveguide series-coupled racetrack resonators exhibiting the Vernier effect were designed by us and fabricated at a leading edge foundry. The free spectral range was 36 nm, which is comparable to the span of the optical C-band. The drop port response showed interstitial peak suppression between 9 dB and 17 dB and minimal resonance splitting.
16
Wexler, Sergej. "Höchstempfindliche Absorptionsmessungen im Resonator eines Faserlasers." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984672311.
Full text
17
Li, Mingwei Mayer Theresa S. "Hybrid integration of nanowire resonator arrays." [University Park, Pa.] : Pennsylvania State University, 2008. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2212/index.html.
Full text
18
Bedford, Robert George. "Finite-aperture tapered unstable resonator lasers." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289968.
Full textAbstract:
The development of high power, high brightness semiconductor lasers is important for applications such as efficient pumping of fiber amplifiers and free space communication. The ability to couple directly into the core of a single-mode fiber can vastly increase the absorption of pump light. Further, the high mode-selectivity provided by unstable resonators accommodates single-mode operation to many times the threshold current level. The objective of this dissertation is to investigate a more efficient semiconductor-based unstable resonator design. The tapered unstable resonator laser consists of a single-mode ridge coupled to a tapered gain region. The ridge, aided by spoiling grooves, provides essential preparation of the fundamental mode, while the taper provides significant amplification and a large output mode. It is shown a laterally finite taper-side mirror (making the laser a "finite-aperture tapered unstable resonator laser") serves to significantly improve differential quantum efficiency. This results in the possibility for higher optical powers while still maintaining single-mode operation. Additionally, the advent of a detuned second order grating allows for a low divergent, quasicircular output beam emitted from the semiconductor surface, easing packaging tolerances, and making two dimensional integrated arrays possible. In this dissertation, theory, design, fabrication, and characterization are presented. Material theory is introduced, reviewing gain, carrier, and temperature effects on field propagation. Coupled-mode and coupled wave theory is reviewed to allow simulation of the passive grating. A numerical model is used to investigate laser design and optimization, and effects of finite-apertures are explored. A microfabrication method is introduced to create the FATURL in InAlGaAs/-InGaAsP/InP material emitting at about 1410 nm. Fabrication consists of photolithography, electron-beam lithography, wet etch and dry etching processes, metal and dielectric electron-beam evaporation, and rapid-thermal annealing. FATURLs are compared to infinite aperture TURLs, and show significant improvements in differential quantum efficiency (more than 40%) under pulsed-current operation. Far-field measurements show diffraction-limited divergence up to at least 2.3 x Ith, and spectral characteristics show good control over the longitudinal mode spectrum. Finally, several modifications to the laser design and fabrication are presented to improve laser performance.
19
Doumanis, E. D. "Helical resonator filters for space applications." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546046.
Full text
20
Keßler, Hans [Verfasser]. "Resonator-kontrollierte Materiewellen-Superradianz / Hans Keßler." München : Verlag Dr. Hut, 2016. http://d-nb.info/1084385635/34.
Full text
21
Coetzee, Nicola. "Asymmetrical S-band coupled resonator filters." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/2287.
Full textAbstract:
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2005.Due to a more densely packed frequency spectrum, there is an increasing demand for narrow band filters with asymmetrical transfer function characteristics. The resulting coupling matrices contain both positive and negative couplings, cross couplings and individual resonator frequency offsets.
22
Lahiri, Basudev. "Split Ring Resonator (SRR) based metamaterials." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/1622/.
Full textAbstract:
Metamaterials are artificial materials that are known to produce extraordinary electromagnetic responses due to their constituent artificially-engineered micro- or nanostructures of dimensions smaller than that of the wavelength of light. The Split ring resonator (SRR) is such a nanostructure that forms the basic unit of a metamaterial. Since the dimensions of the SRRs are required to be smaller than the resonance wavelength, it becomes critical when response is required at the near infrared and optical wavelengths. In this thesis the various properties of the nanoscale SRRs are studied that resonates in the infrared and visible spectrum. The SRRs mentioned in this thesis are made of both aluminium and gold and have been fabricated on silicon and silica substrates using standard electron beam lithography (EBL) techniques. The effect of different metals (Al and Au) on the resonance of SRRs is studied. A substantial shift is reported, in the response of arrays of similarly sized SRRs, made respectively of aluminium and of gold. It is shown that by using aluminium based SRRs instead of gold; the magnetic resonance of SRRs can be shifted into the visible spectrum. The effect of titanium adhesion layers on the properties of SRRs are considered and it is shown that even a 2 nm thin layer of titanium can red-shift the SRR resonance by 20 nm. It is shown, that by adding asymmetry between the geometries of similar sizes SRRs, it is possible to produce a steeper resonance response, thereby increasing the quality factor of the SRRs. This steep response of asymmetric split ring resonators (A-SRRs) are utilised for the optical detection of very thin film organic compounds. It is further shown that by localising the organic compound to specific regions of the A-SRRs, greater enhancement in optical detection could be achieved. Finally, the same property of A-SRRs are utilised for the enhanced detection and differentiation between different DNA strands.
23
Vigen, Leidulv. "Silisium Racetrack Resonator : Design og Fabrikasjon." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24588.
Full textAbstract:
Microfotonikk er en undergren av fotonikk rettet mot integrerte systemer på en enkelt halvlederbrikke. Det innebærer utforming, fabrikasjon og testing av optiske komponenter som skal fabrikkeres på mikro-eller nanonivå. Eksempler på disse komponentene er dielektriske bølgeledere, mikroresonatorer, lysmodulatorer, koplinger, periodiske strukturer og mer.
24
Bian, Zhixi. "INP based microring resonator coupled lasers /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2004. http://uclibs.org/PID/11984.
Full text
25
Opie, David B. "A superconducting compact hydrogen maser resonator." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539623811.
Full textAbstract:
The discovery of high critical temperature superconductors (HTSC) has raised the temperature at which the greatly reduced surface resistance, characteristic of superconducting materials, may be exploited. For microwave frequencies below 100 GHz, the surface resistance, R{dollar}\sb{lcub}s{rcub}{dollar}, at liquid nitrogen temperatures (77K) of the new HTSC materials is found to be better than copper measured at the same temperature and frequency. Consequently, the miniaturization of passive microwave components will be among the first applications of these new materials. This dissertation details the development, testing and evaluation of a superconducting compact hydrogen maser resonator made from electrophoretic Y{dollar}\sb1Ba\sb2Cu\sb3{dollar}O{dollar}\sb{lcub}7-\delta{rcub}{dollar} (YBCO). Such a resonator could sustain active maser oscillation and would therefore be an excellent compact frequency source. This compact maser could yield significant volume and weight savings for space applications where masers are used as frequency standards. The compact resonator is a loop-gap (split-ring) lumped element resonator similar to that previously suggested for compact maser applications. This resonator is made superconducting using an electrophoretic process developed for the deposition of thick film polycrystalline HTSC on large non-planar metallic substrates. The low R{dollar}\sb{lcub}s{rcub}{dollar} of the YPCO deposited onto the surface of the electrode loading structure, inside of the loop-gap resonator, yields cavity quality factors comparable to those of the much larger TE{dollar}\sb{lcub}011{rcub}{dollar} maser resonator but in a much smaller package. The fields of the loop-gap resonator are uniform in the hydrogen interaction region. However, in the neighborhood of the electrodes, the fields are analogous to the TEM fields associated with stripline geometries. These microwave fields have been investigated by numerical analysis and the dependence of the filling factor, ({dollar}\eta\sp\prime{dollar}) and the cavity quality factor, (Q{dollar}\sb{lcub}c{rcub}{dollar}), as a function of the cavity dimensions is discussed. With this information, the cavity design has been optimized to find the cavity size and shape that will yield the lowest Allan deviation with respect to the random thermal frequency fluctuations.
26
Lim, Beng-Teck 1974. "Dielectric Resonator Antennas : theory and design." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/36782.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (leaves 117-122).
Theoretical models for the analysis of Dielectric Resonator Antenna (DRA) are developed. There are no exact solutions to many of the problems in analytical form, therefore a strong focus on the physical interpretation of the numerical results is presented alongside theoretical models. I have used the physical interpretation of the numerical results to lay down some important design rules. A few new inventions associated with the DRA are also included. These are the elliptical DRA, the DRA with a rectangular slot, the adjustable reactance feed, the triangular DRA and the dual band DRA-patch antenna.
by Beng-Teck Lim.
M.Eng.
27
Fayad, Hazem A. "Field forming in dielectric resonator antennas." Thesis, Heriot-Watt University, 2008. http://hdl.handle.net/10399/2197.
Full textAbstract:
Dielectric Resonator Antennas (DRAs) propagate electromagnetic waves by setting up resonant modes determined by their physical geometry and excitation feeds. Just as preferential directions of radiation can be designed for conductive antennas; it was thought that far field radiation pattern of DRAs could be manipulated similarly using different dielectrics. Two types of mixed dielectric antennas were investigated i) a variable dielectric discontinuity ii) air and solid dielectric mix.
28
Hay, Robert Russell. "Digitally-tunable surface acoustic wave resonator." [Boise, Idaho] : Boise State University, 2009. http://scholarworks.boisestate.edu/td/58/.
Full text
29
Catherall, Thomas. "New geometries for ring resonator sensing." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/new-geometries-for-ring-resonator-sensing(c083bfc1-de50-41b0-a84d-135f3f9ab700).html.
Full textAbstract:
This thesis presents a detailed study of complementary metal-oxide-semiconductor (CMOS) compatible silicon waveguide and ring resonator technologies. The project specifically focuses on a range of slotted ring resonator configurations comprised of rib-style waveguides. Single ring resonators and Mach-Zehnder interferometers with double rings and central drop port channels have been successfully characterised. Thermal tuning techniques using on-chip heaters were used to determine their sensitivities. A stringent signal cleaning method was also developed to remove systematic background noise. Analysing the transmission signals produced by the Mach-Zehnder interferometers with double rings and a central drop port, it was revealed that coupled resonator induced transparency (CRIT) is created along with Fano-type resonances when the resonant peaks of the two ring resonators are tuned to overlap. The tuning of these features revealed a 2.7 and 2-fold improvement in device sensitivity. A 3x3 transfer matrix model has been developed to simulate the behaviour of light travelling through this configuration. Modelling suggests that effective refractive index and relative phase are the key factors in determining this behaviour. When tuned to close proximity, a resonant âsuperstateâ is achieved in which a modified model is required. Applying the single ring resonators to biosensing applications, basic refractive index testing and a glucose sensing calibration were conducted. A polydimethylsiloxane (PDMS) based microfluidics system was also developed to improve the reliability of sensing and enable automation. Using silicon nitride ring resonators with inkjet-printed upconverting nanoparticles, it was found that the evanescent field of the rings could stimulate the upconversion process revealing visible spectrum emission around the rings.
30
Djurberg, Axel, Fredrik Forsberg, Anton Lind, and Ludvig Snihs. "Wireless Power Transfer in Cavity Resonator." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444250.
Full textAbstract:
The purpose of this paper is to achieve wireless power transfer inside a resonating cavity, and thereby apply this to charge batteries. The idea is to convert radio frequency waves into direct current, which can charge the batteries. This was done by creating an LC-antenna, which in turn was connected to a rectifier. A data logger was also built, this to be able to read and log the power within the cavity to examine its power distribution. Because of COVID-19 restrictions, access to laboratory and equipment was limited. Due to this, smaller experiments where performed to make sure that all parts worked as intended before trying to perform tests inside the cavity resonator. The results were varied, some favorable, some not. However, all experiments gave insight and further understanding on the issue. The cavity operations had varied results. The data logger was able to pick up, at most, 7.6 % of the power output by the function generator. However, some problems arose with the rectifier which resulted in it not working for higher frequencies. Though, it was capable of rectifying RF signals at lower frequencies from a function generator, which was used to charge a battery. Consequently, there was no charging of batteries inside the cavity. However, three dimensional wireless power transfer was achieved. With some improvements to the current designs, the main goal could be accomplished
31
Lange, Birgit. "Resonator-QED-Experimente mit einzelnen 40Ca+-Ionen." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-67486.
Full text
32
Laschek, Michael. "Kontinuierlich weit abstimmbare Laserdioden mit externem Resonator." [S.l. : s.n.], 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=954346572.
Full text
33
Lawson, Llewellyn Rhys. "Hybrid silicon-organic ring resonator photonic devices /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/11542.
Full text
34
Carrière, James Thomas Anthony. "Ion-exchanged ring resonator integrated optic devices." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/290056.
Full textAbstract:
Ion-exchanged ring resonators are presented as inexpensive yet highly sensitive integrated optic devices. Several historical applications for ring resonators are outlined then compared with competing technologies. The theory of ring resonator devices is described in detail. The optimum designs for both single and double arm ring resonator configurations are discussed. Ring resonator performance is shown to depend on both the waveguide propagation loss and coupling efficiency. A theoretical model of the ion exchange process is presented and used to determine the processing parameters that minimize bend loss. The coupling efficiency is then modeled for the theoretical waveguide profile. A fabrication recipe for producing high performance ring resonators is developed and the performance of several devices is analyzed. The applications of ring resonator devices for accurate measurement of waveguide birefringence and for rotation sensing are examined. A birefringence measurement technique using ring resonators is presented and the sensitivity of this method is compared to other approaches. The theoretical analysis of the rotational sensitivity of ion-exchanged ring resonator gyroscopes is presented and is shown to have an improvement of two orders of magnitude over previously reported ion-exchanged gyroscopes.
35
Merrill, Douglas Richard 1962. "Gain-bandwidth effects on the resonator filter." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/291772.
Full textAbstract:
The purpose of this study is to analyze the resonator filter, and to determine the effects of gain-bandwidth on the dominant complex conjugate pole pair. Optimization methods are then used as a design tool to determine the compensation required to shift the dominant pole pair back to their original design locations. New design values resulting from the compensation are used for the final circuit. Simulations are run to verify that the new design produces the desired magnitude response. The roots of the characteristic equation are checked to verify the proper location of the dominant pole pair. A comparison is made between the third order approximation and the fifth order one.
36
Hopkins, Richard. "Millimetre-Wave measurements using the ring resonator." Thesis, University of Surrey, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492975.
Full textAbstract:
This thesis presents a thorough analysis of the ring resonator, and studies the use of the ring at millimetre-wave frequencies (above 30GHz). An equivalent circuit for the ring is derived which is useful for extracting data from measured circuits, and accounts for different loss mechanisms and loading effects of the feed circuit. New analysis is presented on the effects of curvature, which is shown to influence the resonant frequencies and cause radiation which increases the loss in the ring.
37
Choe, Seok Yun. "Investigation of a constricted annular acoustic resonator." Thesis, Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/8575.
Full textAbstract:
Approved for public release; distribution is unlimitedOne topic of current interest in thermoacoustic research is an annular prime mover Lin et al., J. Acoust. Soc. Am, 100, 2846 (1996). The staring point for this research is an investigation of a constricted annular resonator. A literature search of the field resulted in surprisingly few references. The results of analytic, numerical, and experimental investigations are presented. Introducing a constriction into an annular resonator splits each longitudinal duct mode into two modes, one of a higher frequency with a pressure antinode at the constriction and one at a lower frequency with a velocity antinode near the constriction. The lower mode is more sensitive to changes in the length and porosity of the constriction than the higher mode. Overall agreement between measured and predicted mode shapes and resonance frequencies is very good. It was found that it is necessary to include end corrections at the constriction to get accurate agreement between measured and predicted results.
38
Burmaster, Charles Lyman. "Reciprocity calibration in a plane wave resonator." Thesis, Monterey, California. Naval Postgraduate School, 1985. http://hdl.handle.net/10945/21518.
Full text
39
Duncan, Arlene. "Multifold laser resonator for annular gain media." Thesis, Heriot-Watt University, 1991. http://hdl.handle.net/10399/835.
Full text
40
Seawright, Stephen William James. "CAD of microwave dielectric resonator stabilized sources." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334642.
Full text
41
Fox, Andrew John. "Invasive varactor tuning of a dielectric resonator." Thesis, Leeds Beckett University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297492.
Full text
42
Youngsman, John M'Kay. "An extensional mode resonator for vibration harvesting." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Dissertations/Spring2009/j_youngsman_042109.pdf.
Full textAbstract:
Thesis (Ph. D.)--Washington State University, May 2009.Title from PDF title page (viewed on Apr. 19, 2010). "College of Engineering and Architecture." Includes bibliographical references (p. 113-116).
43
Poon, Joyce Kai See Yariv Amnon. "Active and passive coupled-resonator optical waveguides /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-05242007-105741.
Full text
44
Mookherjea, Shayan Yariv Amnon. "Coupled-resonator optical waveguides and multiplexed solitons /." Diss., Pasadena, Calif. : California Institute of Technology, 2003. http://resolver.caltech.edu/CaltechETD:etd-05152003-144457.
Full text
45
He, Tianhao. "Filtering amplifiers based on coupled resonator circuits." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5851/.
Full textAbstract:
Terahertz (THz) wireless communication systems over 300 GHz can offer broad bandwidth, but they have limitations, such as high precision fabrication requirements, high fabrication cost and lossy system components. This thesis introduces a THz communication system concept based on low-cost and high precision micromachining techniques, also a new design approach to achieve a low loss system for THz communication components and systems. In order to minimise the components and systems losses, this thesis proposes a design approach for filtering amplifiers which removes the lossy planar matching and interconnection circuits to complete the transistor amplifiers design. The technique also adds filters resulting in a combined filtering amplifier. To enable this, an analytical design method for filtering amplifiers based on the conventional passive coupling matrix for filters is expanded for the filtering amplifiers. Novel coupled resonator circuits, including a general transistor model for the first time is investigated and a new [\(T\)] matrix is introduced to facilitate the transistor element. Complete mathematical formulas are provided in this thesis for the coupled resonator circuits for transistor amplifiers. Two physical design examples at X band are provided in this thesis to demonstrate the usage of the novel coupling matrix with a simple mathematical synthesis. A waveguide filtering amplifier is demonstrated using waveguide resonators. This waveguide amplifier reflects the design considerations and methods for future THz amplifier developments. Good correlations between mathematical synthesis results and physical measurements are achieved for the waveguide filtering amplifier, with 3 clearly observed poles in passband, verifying the order of the filters.
46
Kang, Joung-Mo 1978. "Piezoelectric MEMS resonator characterization and filter design." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28418.
Full textAbstract:
Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (p. 98-100).
This thesis presents modeling and first measurements of a new piezoelectric MEMS resonator developed at Draper Laboratory. In addition, some simple filter designs incorporating the resonator with predicted performance parameters were analyzed, with a special focus on the suitability of using the Draper resonator to implement these filters. The four-element Butterworth Van-Dyke model, the traditional circuit model used to describe crystal resonators, was predicted to match the theoretically derived electrical behavior of the fundamental-mode resonance. A three-element "pi" network model was used to describe the overall test structure. Transformations and algorithms to convert measured s-parameter data into best-fit model parameters were developed and successfully tested on commercial thin film resonators. Measurement of the first Draper resonators was complicated by fabrication difficulties and a resulting large parasitic which only allowed low frequency longitudinal resonances to be observed. However, the observed resonances at 125.3 MHz and 148.3 MHz were found to vary with geometrical parameters as expected, providing evidence that the design is viable. Initial resonator Q was estimated to be 542. Filters were designed with estimated resonator parameters after process optimization. Three topologies, simple (coupled) ladder, dual resonator ladder, and full lattice, are described and the limits and tradeoffs among them are discussed given the Draper resonator properties. Numerical examples and an example filter-plus-resonator design process are provided. Manufacturing tolerances and their effect on resonator and filter parameters are discussed. Finally, some considerations when implementing an integrated filter bank are outlined.
(cont.) The filter analyses bring to light two major goals for the next stage of resonator development. First, an accurate tuning method must be devised as the resonator bar's small size makes manufacturing errors on the order of tens of nanometers significantly affect filter characteristics. Second, a lower impedance level for the resonator is desirable to allow robust interaction with integrated RF circuitry.
by Joung-Mo Kang.
M.Eng.and S.B.
47
Hou, Stephen Ming-Chang 1981. "A piezo-tunable gigahertz cavity microelectromechanical resonator." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28405.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (p. 155-158).
RF systems need high-frequency widely-tunable high-Q bandpass filters for channel selection filters and local oscillators. This thesis describes the design, fabrication and testing of a electromagnetic cavity resonator designed for such applications. Alternative technologies provide wide tuning or high Q, but not both, and are generally not tunable. This resonator is distinguished by its simultaneous high Q near 200 and its wide high-frequency tuning range of 2.5 GHz to 4.0 GHz, which have been experimentally demonstrated. The resonator is fabricated using standard MEMS technologies and consists of a gold-lined capacitor and toroidal inductor cavity formed by etching silicon in potassium hydroxide. Frequency tuning is performed by compressing the cavity to close the capacitor gap. Testing was done with a piezoelectric actuator for this task. The match between the modeled and measured impedance is extremely good up to and beyond 5 GHz, with less than a 1% error in magnitude and phase.
by Stephen Ming-Chang Hou.
M.Eng.
48
Sprenger, Peter Hugo. "Birdcage resonator design in magnetic resonance imaging." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36069.
Full textAbstract:
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1995.Includes bibliographical references (p. 101).
by Peter Sprenger.
M.S.
49
Araya, Kleinsteuber Bernardita Maria. "Characterization of the magnetic acoustic resonator sensor." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613129.
Full text
50
Thiruvenkatanathan, Pradyumna. "Mode-localized sensing in micromechanical resonator arrays." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609334.
Full text