Дисертації з теми "Resonator frequency"
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Pourkamali, Siavash. "High frequency capacitive single crystal silicon resonators and coupled resonator systems." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/26563.
Повний текст джерелаCommittee Chair: Ayazi, Farrokh; Committee Member: Allen, Mark; Committee Member: Brand, Oliver; Committee Member: Degertekin, Levent; Committee Member: Papapolymerou, John. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Desjardins, Jason. "Reconfigurable Dielectric Resonator Antennas." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19838.
Повний текст джерелаChambers, James Paul. "High frequency Pound-Drever-Hall optical ring resonator sensing." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85824.
Повний текст джерелаBakam, Nguenouho Odette Sandrine. "Ceramic coaxial resonator filter in a CubeSat system." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2639.
Повний текст джерелаRF and microwave filters can be implemented using ceramic coaxial resonators. This technology has been widely employed in nanosatellite communications systems recently, owing to its large quality factor (Q), permitting them to have low loss and narrow bandwidth. Features such as high selectivity, high power handling, excellent rejection, and low passband insertion loss are just a few of the key performance areas offered by ceramic coaxial resonators. This feature makes them suitable for use in bandpass filters. Applications with demanding specifications requiring low volume and mass make use of this technology. Fulfilling the required performance goals can be challenging, given the size and weight restriction. Difficulties such as finding the correct length of resonators and the coupling capacitors’ structure to meet the size restriction, limit the type of ceramic coaxial resonators to use. This thesis presents the design of a bandpass filter using ceramic coaxial resonators, which provides evidence of the concept for F’SATI’s future needs. This design will be used in an imminent space mission and the intention is to mount the bandpass filter in the receiver communications system. An intensive investigation was conducted into the use of filters for nanosatellite communication systems. The Chebyshev LC ladder low pass prototype was used to derive the conventional bandpass filter. Thereafter, the coupled resonator bandpass filter was derived using the conventional bandpass filter topology combined with the admittance inverter. Following this, using the ceramic coaxial resonators datasheet and information provided by the manufacturers, the coupled resonator bandpass filter was converted into a 3D model for further simulations, using CST Microwave Studio®. The ceramic coaxial resonator filter fabricated using Rogers’s material provided satisfactory results at its operating frequency between 2.2 GHz and 2.3 GHz. A radiation level test was performed on the filter to justify the use of the metallic enclosure. The test presented a low level of radiation measured at the filter operating frequency (2.25 GHz). The filter was also subjected to temperature cycling.
French–South African Institute of Technology (F’SATI) National Research Foundation (NRF)
Lennartsson, Christian. "The Frequency Dependence of the Surface Sensitivity of Resonator Biosensors." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9741.
Повний текст джерелаEn studie i hur känsligheten avtar från ytan hos biosensorer med höga frekvenser presenteras. Med ny teknologi som avancerade elektroakustiska tunnfilms komponenter, så kallade FBARs, blir tidigare outforskade områden som decay längden möjliga att studera.
För att undersöka hur frekvenssvaret och känsligheten påverkas av interaktioner långt ut från en sensoryta används proteinkemi. Ett protokoll har optimerats innehållande aktivering med EDC/NHS och fibrinogen för att säkerställa en jämn tjocklek och fördelning av ett adsorberat proteinlager över en yta.
Dessa ytor kontrollerades först med hjälp av ellipsometri och sedan i ett QCM instrument. Alla experiment med de högfrekventa FBAR sensorerna utfördes vid Ångströmslaboratoriet i Uppsala där pågående forskning inom området finns.
Resultaten bekräftar teorin om en avtagande känslighet i och med ett ökat avstånd från ytan. En experimentell genomförd och beräknad tjocklek för decay längden uppskattades som inte helt stämde överens med den teoretiskt beräknade.
En ny term föreslås då frekvenssvaret hos en biosensor planar ut. Detta är en effekt som sker vid dubbla tjockleken av den teoretisk beräknade tjockleken av decay längden och har fått namnet; detection length. Efter denna längd eller gräns observeras en inverterad signal som det än så länge inte finns någon förklaring till.
A study of the sensitivity decrease of biosensors working at high frequencies is presented. With new technology such as film bulk acoustic resonators (FBAR), issues like the decay length is no longer irrelevant theory but may cause limitation in the system as well as it offers new detection possibilities.
To investigate the frequency response and sensitivity, layer-on-layer construction chemistry was used. A protocol involving activation with EDC/NHS and coupling chemistry with fibrinogen was optimized to ensure accurate thickness and uniformly distribution of each layer over the surface.
Surfaces were characterized using null ellipsometry and the protocol was tested in a traditional quartz crystal microbalance (QCM). Experiments with the FBAR were preformed at the Ångström laboratory in Uppsala were there is ongoing research and development in FBAR technology.
The results confirmed the theory of decreasing frequency and sensitivity further out from the surface. An experimental and estimated thickness was calculated which to some extent correlates to the theoretically calculated decay length.
A new terminology is suggested when the frequency levels off. It occurs approximately at twice the distance and thickness of the theoretically calculated decay length and is given the name; detection length. Beyond the detection length an inverted signal is observed which cannot yet be explained for.
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.
Повний текст джерелаBanghua, Zhou, and Huang Mingsheng. "A Dielectric Resonator Stabilized Frequency Modulation Oscillator in the S-Band." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/611725.
Повний текст джерелаWith the development of the airborne telemetry technique, it will be demanded that the transmitting sets on the missiles are more reliable and smaller. A frequency modulation (FM) oscillator stabilized with a dielectric resonator (DR), which can operates in the S-band directly, is presented. The FM oscillator is of simple circuit, reliable operation in the stabilization, small size, light weight and low cost. It will have a certain prospect of application in the airborne telemetry transmitting sets.
Ganesan, Adarsh. "Phononic frequency combs." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274878.
Повний текст джерелаWang, Zheng. "DEVELOPMENT OF ACOUSTIC MODELS FOR HIGH FREQUENCY RESONATORS FOR TURBOCHARGED IC-ENGINES." Thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91335.
Повний текст джерелаBrand, Tobias Gerhardus. "Synthesis methods for multi-band coupled resonator filters." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95910.
Повний текст джерелаENGLISH ABSTRACT: In this dissertation a number of techniques to design multi-band filters, with specific focus on coupled resonator implementations, is presented. Multi-band transfer functions are constructed from single-band transfer functions using frequency mapping methods. A general class of rational mapping functions is presented that can accommodate arbitrary bandwidth specifications. Multi-band circuits are synthesised directly from multi-band transfer functions and are obtained by applying reactance transformations to single-band prototype circuits. For the direct synthesis of multi-band filters from multi-band transfer functions coupling matrix synthesis methods are employed. The circuits that result from matrix synthesis methods tend to have topologies that are undesirable from a practical perspective and must be simplified using rotations of the coupling matrix. The synthesis of multi-band filters through reactance transformations is both simple and result in filters that have practical topologies for realisation as coupled resonator circuits. Multiple filters are designed using different design methodologies and different transmission line technologies to illustrate the various design possibilities. The designs include both all-pole and cross-coupled filters and employ single-layer stripline, multi-layer stripline as well as coaxial resonators as transmission line technologies for the implementations.
AFRIKAANSE OPSOMMING: In hierdie proefskrif word verskeie ontwerpstegnieke vir multi-band filters aangebied en word daar spesifiek klem gelê op filters wat as gekoppelde resoneerder strukture geïmplimenteer kan word. Multi-band oordragsfunksies word geskep uit enkelband oordragsfunksies deur gebruik te maak van wiskundige afbeeldingstegnieke. ’n Spesiale klas van rasionale funksies word voorgestel wat spesifiek gebruik kan word om multi-band funksies te skep wat ’n arbitrêre bandwydte spesifikasie het. Multi-band stroombane word direk gesintetiseer vanuit multi-band oordragsfunksies en word ook verkry deur die toepassing van reaktansietransformasies op enkelband stroombane. Vir die direkte sintese van multi-band stroombane vanuit multi-band oordragsfunksies word stroombane gesintetiseer as koppelmatrikse. Stroombane wat op hierdie wyse gesintetiseer word is geneig om topologieë te hê wat nie baie gesog is vanuit ’n praktiese perspektief nie en matriks rotasies word dan hier ingespan om die stroombane se topologieë te vereenvoudig. Die sintese van multi-band stroombane deur gebruik te maak van reaktansietransformasies is beide eenvoudig en lei tot stroombane wat praktiese topologieë het vir implimentering as gekoppelde resoneerder strukture. Die ontwerpsmoontlikhede wat die verskillende metodieke bied word geïllustreer deur die ontwerp van verskeie filters op verskillende maniere waar daar gebruik gemaak word van verskeie transmissielyn tegnologië. Die filter ontwerpe sluit filters in waar alle transmissienulle by oneidige frekwensies is, sowel as gevalle waar somige transmissienulle by eindige frekwensies is. Die filters word geïmplimenteer deur gebruik te maak van koaksiale resoneerders sowel as enkellaag en multilaag strooklyn.
McIntyre, Dustin L. "The coaxial cavity resonator as a prototype RF IC engine ignition source." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1504.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains xii, 119 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 106-107).
Xu, Changting. "Investigation of Modulation Methods to Synthesize High Performance Resonator-Based RF MEMS Components." Research Showcase @ CMU, 2018. http://repository.cmu.edu/dissertations/1135.
Повний текст джерелаPalomo, Timothy Joseph. "Microfluidically Reconfigurable Frequency-Agile RF Filters with Wide Frequency Tuning Range and High Power Handling Capability." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6124.
Повний текст джерелаWhitehead, Neil. "Static and rotational non contact torque measurement utilising a mechanical resonator providing a frequency output." Thesis, Brunel University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367860.
Повний текст джерелаLewis, A. P. "The determination of the fundamental resonant frequency of a substrate-mounted open cylindrical dielectric resonator." Thesis, University of Bath, 1986. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370989.
Повний текст джерелаStefan, Anca Irina. "Modeling and design of resonators for electron paramagnetic resonance imaging and ultra high field magnetic resonance imaging." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133293403.
Повний текст джерелаWalls, Tom. "The application of a Fabry-Perot resonator to the design of a low noise microwave frequency source." Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1959.
Повний текст джерелаSubramanian, Ajay. "A LOW PHASE NOISE K-BAND OSCILLATOR UTILIZING AN EMBEDDED DIELECTRIC RESONATOR ON MULTILAYER HIGH FREQUENCY LAMINATES." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2357.
Повний текст джерелаM.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
Maxey, Christopher Allen. "Switched-Tank VCO Designs and Single Crystal Silicon Contour-Mode Disk Resonators for use in Multiband Radio Frequency Sources." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/10074.
Повний текст джерелаMaster of Science
Munyai, Pandelani Reuben Mulalo. "On the improvement of phase noise in wideband frequency synthesizers." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63003.
Повний текст джерелаThesis (MEng)--University of Pretoria, 2017.
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
Maricar, Mohamed Ismaeel. "Design of circuits to enhance the performace of high frequency planar Gunn diodes." Thesis, De Montfort University, 2014. http://hdl.handle.net/2086/10858.
Повний текст джерелаYasar, Orten Pinar. "Numerical Analysis, Design And Two Port Equivalent Circuit Models For Split Ring Resonator Arrays." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611620/index.pdf.
Повний текст джерелаs HFSS software that is based on the finite elements method (FEM). Some of these structures are constructed over low-loss dielectric substrates and their complex scattering parameters are measured to verify the numerical simulation results. The major purpose of this study has been to establish equivalent circuit models to estimate the behavior of SRR structures in a simple and computationally efficient manner. For this purpose, individual single ring SRR cells with multiple splits are modeled by appropriate two-port RLC resonant circuits paying special attention to conductor and dielectric loss effects. Results obtained from these models are compared with the results of HFSS simulations which use either PEC/PMC (perfect electric conductor/perfect magnetic conductor) type or perfectly matched layer (PML) type boundary conditions. Interactions between the elements of SRR arrays such as the mutual inductance and capacitance effects as well as additional dielectric losses are also modeled by proper two-port equivalent circuits to describe the overall array behavior and to compute the associated transmission spectrum by simple MATLAB codes. Results of numerical HFSS simulations, equivalent circuit model computations and measurements are shown to be in good agreement.
Khan, Md Mahfujul H. "Understanding Impact Load Wave Transmission Performance of Elastic Metamaterials." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1479146177020136.
Повний текст джерелаGuillot, Pierre. "Contribution à l’étude des architectures de radiocommunications à références d’horloges hautes fréquences : application des résonateurs BAW à la génération de fréquence de référence dans les systèmes de communication mobile." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1025/document.
Повний текст джерелаThis thesis deals with the gigahertz range reference frequency generation. In a first part, this document presents the design of a 500 MHz oscillator in a 65 nm CMOS process using a 2 GHz Bulk Acoustic Wave resonator. A digital frequency control is implemented using a switched capacitor bank in parallel to the resonator. The tuning range is up to 500 kHz with a minimum step of 200 Hz. The oscillator core uses a differential topology and is designed for low phase noise (-128 dBc/Hz at 100 kHz offset) at low power consumption (0.9 mW). It is followed by a low noise divider which provides a 500 MHz output with a phase noise of -139 dBc/Hz at 100 kHz offset from the carrier. In a second part, we consider a method for the calibration of a BAW based frequency reference. In fact, the frequency variations of a BAW oscillator against process, supply, temperature and aging effects make difficult its use as a frequency reference. We propose here a method based on Kalman filtering to identify with high precision a behavioral model of this BAW reference, thus enabling its use in an open loop frequency tuning. A precision of 0.4 ppm is achieved
Knuth, Thomas. "Auslegung, Entwicklung und Inbetriebnahme eines longitudinalen und transversalen Feedbacksystems zur Dämpfung gekoppelter Teilchenpaket-Instabilitäten im BESSY-II-Speicherring." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2000. http://dx.doi.org/10.18452/14601.
Повний текст джерелаThe appearance of coherent coupled bunch oscillations in modern electron storage rings contributes to a significant reduction of the performance as a synchrotron light source. These instabilities occur in longitudinal as well as in transversal directions and lead to a reduction of brilliance and in the worst case to beam loss. The most effective tool for controlling the instabilities is a feedback system, which detects and damps the excited oscillation amplitudes. This thesis describes the development, installation and commissioning of two completely different systems for damping of longitudinal synchrotron oscillations and transversal betatron oscillations. The transverse feedback system incorporates the horizontal as well as the vertical beam direction. Both systems are not restricted to damping certain modes of oscillation, but have been designed for the independent stabilization of all bunches separately. All components have been designed, built and commissioned within two years. In the scope of this thesis the development and the functionality of important components will be explained and the process of commissioning will be described. Measurements emphasize the efficiency of both systems, which are being used continuously for damping instabilities during user operation up to currents of 220 mA. In the scope of this thesis the improved experimental conditions for the user of the synchrotron light could be shown. Consequently, BESSY II possesses two efficient feedback systems which damp coherent oscillations of all phase space coordinates and guarantee the requirements to the source size of a 3rd generation light source.
He, Shujian. "A TRANSFER MATRIX APPROACH TO DETERMINE THE LOW FREQUENCY INSERTION LOSS OF ENCLOSURES INCLUDING APPLICATIONS." UKnowledge, 2017. https://uknowledge.uky.edu/me_etds/104.
Повний текст джерелаCabras, Flaminia. "Forests as a natural seismic metabarrier: analysis of interaction between trees and Rayleigh waves." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15200/.
Повний текст джерелаZeighami, Farhad. "Sub-wavelength resonators as seismic Rayleigh waves shield." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Знайти повний текст джерелаMiri, Lavasani Seyed Hossein. "Design and phase-noise modeling of temperature-compensated high frequency MEMS-CMOS reference oscillators." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/41096.
Повний текст джерелаDöringshoff, Klaus. "Optical frequency references based on hyperfine transitions in molecular iodine." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19156.
Повний текст джерелаThis thesis deals with the development and investigation of optical absolute frequency references based on rovibronic transitions in molecular iodine. Doppler-free saturation spectroscopy methods are employed to resolve individual transitions of the hyperfine structure with linewidths below 1 MHz in the B-X system of molecular iodine at 532 nm with the second harmonic of Nd:YAG lasers. Electronic feedback control systems are employed for laser frequency stabilization to the line center of the optical transitions with a line splitting of 10^5. With the goal of a space qualified optical absolute frequency reference for future laser-interferometric space missions, two spectroscopy setups were designed and realized in quasi-monolithic, glass-ceramic setups as so called elegant bread board model and engineering model. These iodine references were characterized in detail with respect to their frequency stability and reproducibility and the engineering model was subject to environmental tests, including vibrations and thermal cycling to verify its applicability in future space missions. For the investigation of the frequency instability of these iodine references, a frequency stabilized laser system was realized based on a temperature controlled high Finesse ULE cavity for direct frequency comparisons at 1064 nm. Analysis of the frequency stability of the iodine references revealed exceptionally low fractional frequency instability of 6x10^−15 at 1 s, averaging down to less than 2×10^−15 at 100 s integration time, constituting the best reported stability achieved with iodine references to date. With the demonstrated performance, these absolute frequency references enable precision laser systems required for future space missions that are dedicated to, e.g., the detection of gravitational waves, mapping of the Earth’s gravitational field or precision test of fundamental physics.
Lukacs, Mathew Walter. "Wirelessly sensing resonate frequency of passive resonators with different Q values." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4970.
Повний текст джерелаID: 029809938; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.E.E.)--University of Central Florida, 2011.; Includes bibliographical references (p. 80-81).
M.S.E.E.
Masters
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Laurent, Ludovic. "Nano systèmes électromécaniques résonants à haute fréquence (NEMS HF) : une rupture technologique pour l'imagerie infrarouge non refroidi." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY050/document.
Повний текст джерелаProgress in microelectronics has been mainly driven by informatics needs for addressing both increased performances and lower costs for processors and memories, according to the well-known Moore’s Law. For many years, these tremendous progresses in silicon fabrication and integration have also contributed to the emergence of new type of devices, such as sensors, actuators, filters, clocks or imagers, forming a new class of devices called More than Moore. Uncooled infrared imaging, which uses thermal sensors belongs to this new class of devices. Today thermal sensors principally use a thin resistive layer (mainly vanadium dioxide or amorphous silicon) on a suspended membrane as a thermometer and are called microbolometers. The fabrication cost of thermal cameras has dramatically dropped over the last 20 years, while attaining performances close to the expensive cooled cameras. Nevertheless, the cost of these imagers still remains too high for consumer market (night driving, smartphones, home automation) whereas military applications (surveillance, personal googles) need improved resolutions – in an affordable camera. Therefore, one objective of the microbolometers industry roadmap is to scale down the sensor surface – the pixel pitch – in order to increase the number of imagers fabricated on a silicon wafer. Yet, the pixel pitch reduction goes necessarily with a reduction of the captured infrared power leading to a reduction of the sensor signal. As a consequence, the sensor sensitivity needs to be improved as the pixel pitch scales down. The resistive technology has managed this scaling so far, down to 17µm pixel pitch, allowing a densification of the sensors by a factor 4 every 5 years. Despite this success, the scaling has been recently slowed down, mostly because of microbolometers self-heating issue and 1/f noise which are inherent to the resistive transduction. Our work has focused on a new type of sensor at 12µm pixel pitch, which theoretically gets rid of self-heating and 1/f noise. In our approach, an absorbing plate is excited at its mechanical resonance through two tiny torsion arms using an actuation electrode placed 2µm underneath. Pixel motion is also transduced electrostatically. Since micromechanical resonators feature very low frequency noise, we believe that an uncooled infrared sensor based on the monitoring of its resonance frequency (which changes with temperature through the TCF) should be extremely sensitive. In our work, we present different models (linear and nonlinear) for the pixel mechanical behavior and compare them to experimental characterization of resonators which were fabricated in dense arrays, according to several designs. We measure the frequency stability of our sensors along with their sensitivity to infrared flux. The best devices show a resolution of 30pW/sqrt(Hz), with a response time lower than one millisecond. The scene resolution (NETD) is 2K for an integration time compatible with imaging frame rate. These performances overtake results previously published on this topic with such reduced pixel pitch. We show that a NETD of 20mK (with a response time of 10ms) is reachable at 12µm pixel pitch if we can address the following 3 challenges: a cointegration of the resonators with their electronics, a shared readout of several pixels in the imaging frame rate and an improved TCF by a factor 10. Therefore, we provide different methods in order to improve the TCF. Finally, we present different pixel designs at 5µm pixel pitch which show theoretical performances close to uncooled infrared imaging requirements (NETD=70mK and tau_th=8ms). An optical transduction may also be a new route toward even better signal to noise ratio at low pitch
Balakireva, Irina. "Nonlinear dynamics of Kerr optical frequency combs." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2043.
Повний текст джерелаThis thesis is dedicated to the study of the Kerr optical frequency combs in whispering gallery moderesonators, where the light can be excited by the extern pump. Due to the Kerr effect existing in theseresonators, the quasi-equidistant lines in the spectral domain are generated around the excited mode,that is the frequency comb. This thesis is devided in three chapters. The first one is dedicated to theintroduction of the Kerr comb generation and their applications.The second one presents the analysisof the Lugiato-Lefever equation used for the analytical study of the system, leading to the constructionof two bifurcation diagrams for the normal and anomalous dispersions. They are plotted for twoparameters, which can be controlled during experiments once the resonator has been fabricated,which are the pump power of the laser and its frequency detuning. These diagrams show the areas ofthe parameters for which one, two, or three solutions exist and their stability. The additional numericalsimulations show the exact type of the solution in each area (such as the bright and dark solitons,the breathers, the primary and secondary Kerr combs and chaotical regimes), finally these diagramsshow the parameters of the laser needed to be choosen for the generation of the desired solution.The third chapter is dedicated to the secondary Kerr combs, which are the additional lines generatedbetween the lines of the primary comb. They appear in the anomalous dispersion regime, when thequantity of the pump photons crosses the second-order threshold, which has been found numerically
Sundaresan, Krishnakumar. "Temperature Compensated CMOS and MEMS-CMOS Oscillators for Clock Generators and Frequency References." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13977.
Повний текст джерелаGutierrez, Napoléon. "Peignes de fréquences optiques par effet Kerr dans les micro et mini résonateurs optiques." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30273.
Повний текст джерелаOptical frequency combs find applications in optics, physics, precision spectroscopy and opto-electronics among others. The mode-locked laser is historically the system at the origin of these combs. More recently, in the quest for the miniaturization of optical frequency comb generators, micro-resonators and mini-resonators have emerged as attractive alternatives due to their compact nature as well as their mode selectivity and power enhancement properties. The work presented in this thesis is centered on the modeling of passive resonator based Kerr frequency combs. The first chapter of this thesis presents a state of the art of micro and mini Kerr frequency combs and puts forth the advantages of resonator-based platforms for the generation of optical frequency combs. The second chapter presents the model used to study passive optical resonators in the linear and non-linear regimes. The non-linear approach is based on an Ikeda map, allowing the study of Kerr comb formation in passive resonators. In the third chapter, Kerr frequency combs generated in an integrated resonator are presented. These results are compared to simulation results based on the model presented in the preceding chapter. The last chapter studies the impact of frequency-dependent access coupling parameters on the generation of Kerr frequency combs. Simulation results are presented, bringing to light the importance of the influence that these coupling parameters have on the combs generated in the resonator
Laquerbe, Vincent. "Étude théorique et expérimentale d’un nouveau concept d’antenne VHF miniature et accordable par décharge plasma." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0039/document.
Повний текст джерелаAntenna miniaturisation is a major issue, especially in the VHF band whose wavelengths are significant. Amongst the solution in the litterature, a recent theoretical technique relies upon the electrostatic resonance of negative permittivity (ENG) subwavelength spheres. In this work, the use of a plasma discharge as ENG medium is under consideration. Plasma indeed suggests new potentialities for this kind of small antennas, such as stealth and frequency agility. Firstly, several analytical models are developed to study the electromagnetic response of subwavelength realistic plasma spheres. These models further allow to derive accurate numerical representations that fit commercial electromagnetic solvers. A working prototype that comprises a plasma ignition system within the antenna structure without altering its operation is then designed. It is used to both characterize the plasma discharge and the electromagnetic behavior of the plasma spherical resonator. Finally, this work is extended to the case of planar circuits by integrating a plasma discharge inside microstrip resonators. The design, the modeling and the experimental studies of these resonators highlight the ability of the plasma to tune the resonant frequency
Weed, Matthew. "Wavelength scale resonant structures for integrated photonic applications." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5888.
Повний текст джерелаPh.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics
Shao, Botao. "Fully Printed Chipless RFID Tags towards Item-Level Tracking Applications." Doctoral thesis, KTH, Elektroniksystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142409.
Повний текст джерелаQC 20140304
Ekmekci, Evren. "Design, Fabrication And Characterization Of Novel Metamaterials In Microwave And Terahertz Regions: Multi-band, Frequency-tunable And Miniaturized Structures." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612730/index.pdf.
Повний текст джерела-negative metamaterial structure, called double-sided SRR (DSRR), is proposed in the first part of this study. DSRR combines the features of a conventional split ring resonator (SRR) and a broadside-coupled SRR (BC-SRR) to obtain much better miniaturization at microwave frequencies for a given physical cell size. In addition to DSRR, double-sided multiple SRR (DMSRR), double-sided spiral resonator (DSR), and double-sided U-spiral resonator (DUSR) have been shown to provide smaller electrical sizes than their single-sided versions under magnetic excitation. In the second part of this dissertation, a novel multi-band tunable metamaterial topology, called micro-split SRR (MSSRR), is proposed. In addition to that, a novel magnetic resonator structure named single loop resonator (SLR) is suggested to provide two separate magnetic resonance frequencies in addition to an electric resonance in microwave region. In the third part, two different frequency tunable metamaterial topologies called BC-SRR and gap-to-gap SRR are designed, fabricated and characterized at terahertz frequencies with electrical excitation for the first time. In those designs, frequency tuning based on variations in near field coupling is obtained by in-plane horizontal or vertical displacements of the two SRR layers. The values of frequency shifts obtained for these tunable metamaterial structures are reported to be the highest values obtained in literature so far. Finally, in the last part of this dissertation, novel double-sided metamaterial based sensor topologies are suggested and their feasibility studies are presented.
Волошин, Антон Олександрович. "Мікромеханічно перелаштовувані антенні елементи НВЧ". Doctoral thesis, Київ, 2020. https://ela.kpi.ua/handle/123456789/36406.
Повний текст джерелаTerblanche, Phillip. "Electronically adjustable bandpass filter." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17966.
Повний текст джерелаENGLISH ABSTRACT: This thesis presents the study, analysis and design of electronically tunable filters, that can be tuned over a wide frequency range (20-500MHz), for use in a direct sampling receiver. The final design does not have to be a single filter, but may be comprised of a filter bank which enables switching between the filters. The band of interest is too low to use normal transmission lines and lumped elements have to be used. Different topologies that can implement Coupled Resonator filters with lumped elements are investigated. Devices that can be used for tuning are also investigated and varactor diodes are found to be the most suitable tuning devices currently available. Two filters, one at the high-end and one at the low-end of the band, were designed and built, both using varactor diodes. These filters perform well in terms of tuning range, but achieving low losses with current technologies in this band remains difficult.
AFRIKAANSE OPSOMMING: Hierdie tesis meld die studie, analise en ontwerp van elektronies verstelbare filters, wat verstelbaar is oor ’n wye band (20-500MHz), vir gebruik in ’n direk-monster-ontvanger. Die finale ontwerp hoef nie ’n enkele filter te wees nie, maar kan bestaan uit ’n filterbank wat skakeling tussen die filters toelaat. Die betrokke band is te laag vir die gebruik van normale transmissielyne en diskrete komponente moet gebruik word. Verskillende topologieë wat gekoppelde resoneerder filters implementeer met diskrete komponente is ondersoek. Verstelbare komponente word ook ondersoek en varaktor diodes blyk die mees geskikte verstelbare komponent wat huidig beskikbaar is in hierdie band. Twee filters, een aan die hoë kant en een aan die lae kant van die band, is ontwerp en gebou, beide met varaktor diodes. Hierdie filters het wye verstelbare bereik, maar dit is steeds moeilik om verliese te beperk met die huidige tegnologie.
Олійник, Ольга Юріївна. "Науково-методологічні засади віброчастотного контролю технологічних параметрів в умовах вібрації". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42234.
Повний текст джерелаThesis for a degree of Doctor of Science (Technology), Specialty 05.11.13 – Instruments and Methods of Control and compounds` composition determination. – State Higher Educational Institution «Ukrainian State Chemical-Technological University», Ministry of Education and Science of Ukraine, Dnipro, 2019. The dissertation is devoted to solving the scientific and applied problem of increasing the reliability of the control of technological parameters (density, viscosity, force (pressure)) in a production environment through the development of new mathematical models and methods for determining technological parameters from the amplitude-frequency characteristics of the oscillatory environment of apparatuses, the use of new multiparameter vibration frequency converters with a universal characteristic and variable signal-to-noise ratio, as well as software development STV filtering noisy measurement information with unknown distribution laws. A vibration frequency method has been developed for monitoring and measuring the density, viscosity, force (pressure) of gas-liquid media under industrial conditions using a measuring transducer with a tubular, cylindrical resonator, mathematical models of the amplitude-frequency characteristics of technological parameters in devices of various designs are obtained. Theoretical foundations have been developed for the design of non-metallic tubular flow resonators with a wide scope. A multifunctional vibration frequency converter has been developed for measuring density, viscosity, force (pressure) with a cylindrical resonator, which has a universal characteristic. Research work on the identification of distribution laws has been completed, an Kalman filtering algorithm has been developed for measuring information with increased noise, and the structure of a multidimensional control system for technological parameters with a system for diagnosing the shape of resonator vibrations; improved device for identifying the active state of the operator. Implementation of engineering developments of the thesis was carried out at the leading enterprises of the Dnieper and abroad.
Somer, Jakub. "Využití tlustých vrstev v moderní elektronice." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220230.
Повний текст джерелаFlorián, Antonín. "Synchronizované zdroje časových signálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220289.
Повний текст джерелаHaller, Kristian. "Nonlinear Acoustics Applied to NonDestructive Testing." Licentiate thesis, Karlskrona : Blekinge Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00374.
Повний текст джерелаЧерченко, Максим Олександрович. "Пристрої НВЧ на основі тонких діелектричних резонаторів". Master's thesis, Киів, 2018. https://ela.kpi.ua/handle/123456789/25868.
Повний текст джерелаActuality of theme The use of dielectric resonators in microwave electronics helps to create highly effective resonance devices. Improving the characteristics of these systems is an urgent task. Relationship of work with scientific programs, plans, themes. The work is connected with the scientific programs, plans and themes that are being developed at the department. The purpose and tasks of the study. The purpose of this work is to improve the microwave devices based on thin dielectric resonators. To achieve the goal, you need to accomplish the following tasks: 1. Analyze existing microwave structures. 2. To study the microwave structure on the basis of thin dielectric resonators. 3. Show the prospect of designing devices on microwave based on thin dielectric resonators. The object of the study is the structure of microwave based on thin dielectric resonators. The subject of the study is electrodynamic properties and characteristics of thin dielectric resonators. The method of scientific research includes: methods of analysis of microwave devices, analytical modeling. The practical value of the results. The designs of a controlled phase rotator on the basis of thin dielectric resonators were proposed, which allowed to reduce the control voltage. The applicant's personal contribution: • Electrodynamic characteristics of phase rotators on the basis of thin dielectric resonators have been experimentally investigated. • The designs of phase rotators with reduced control voltage are proposed. Structure and volume of work. The work consists of an introduction, six sections, conclusions and a list of sources used. The total volume of the dissertation is 76 pages. The work includes 16 drawings, 29 tables, list of used sources from 26 titles.
Ліщиновська, Наталія Олександрівна, Наталия Александровна Лищиновская та Nataliya Oleksandrivna Lishchinovska. "Метод синтезу розподілених високодобротних резонаторів з розрідженим діапазоном частот для радіотехнічніх пристроїв та засобів телекомунікацій". Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/47244.
Повний текст джерелаВ результате проведенного анализа методов построения резонаторов установлено, что наиболее перспективными на данном этапе развития распределённых устройств средств телекоммуникаций и промышленного производства радиотехнических материалов, являются устройства селекции на отрезках неоднородных полосковых и коаксиальных линий передачи, обеспечивающих заданную разрядку спектра резонансных частот и имеющих максимально высокую добротность. Однако при реализации таких устройств разработчики сталкиваются с серьёзными трудностями, обусловленными отсутствием аналитических выражений для расчёта добротности резонансных систем, отсутствием методов синтеза высокодобротных резонаторов, а также с отсутствием алгоритмов расчёта их конструктивных параметров. Кроме того, для большинства разработанных устройств не обоснован выбор допусков при изготовлении, что вызывает необходимость регулировок и ведёт к большему проценту брака и повышению себестоимости при производстве. Разработан метод синтеза высокодобротных резонансных систем с позиций спектральной теории неоднородных линий в сочетании с методами численного синтеза. Идея предложенного метода синтеза резонаторов состоит в следующем. Из теории длинных линий известно, что входное сопротивление линии однозначно определяет закон изменения волнового сопротивления. Следовательно, для построения резонатора, обладающего требуемыми электрическими характеристиками надо сформировать его входное сопротивление, в котором были бы заложены все необходимые свойства резонансной системы. В работе в качестве системы универсальных параметров предложено использовать резонансные частоты (спектр линии) и вычеты сопротивления резонатора на резонансных частотах. Тогда, изменяя положение резонансных частот в рабочей области можно добиться заданного положения основной (рабочей) резонансной частоты и требуемого распределения нерабочих (паразитных) резонансов, которые обуславливают паразитные полосы пропускания частотных фильтров. Что касается выбора вычетов на резонансных частотах, то их можно выбрать исходя из дополнительных условий. В качестве данного условия в работе предложено использовать добротность резонатора на основной частоте. Таким образом, изменением спектра в нерабочей области и вычетов на всех частотах спектра можно получить заданное значение добротности основного резонанса. В работе рассмотрены неоднородные линии с потерями В отличие от существующих методов построения резонаторов, ориентированных в основном на однородные линии, получены уточняющие аналитические выражения, позволяющие определять добротность при произвольных зависимостях волнового сопротивления и распределённых потерь от координаты. Разработана математическая модель резонатора, отличительной особенностью которой является минимальное число варьируемых параметров при использовании численных методов оптимизации. На основе этой модели осуществлён синтез резонаторов по полюсам и вычетам входного сопротивления и построена его целевая функция. С использованием численных методов оптимизации (метод скользящего допуска, метод деформированного многогранника) найдены оптимальные значения полюсов и вычетов входного сопротивления резонатора, которые однозначно определяют волновое сопротивление резонатора, обладающего максимальной добротностью при заданном распределении резонансных частот. Разработаны алгоритмы синтеза нерегулярных высокодобротных резонаторов, которые ориентированы на типы неоднородных линий, наиболее часто используемых на практике (коаксиальная, микрополосковая, симметричная полосковая). Предложенные алгоритмы отличаются от известных использованием минимального количества варьируемых параметров и позволяют определить волновое сопротивление резонатора с максимально возможной добротностью. Осуществлена оценка допусков по контролю в процессе производства наиболее важных параметров конструкции и диэлектрических материалов, используемых при изготовлении резонаторов. Разработаны топологии полосковых и коаксиальных резонаторов, имеющих максимальную добротность.
In the robot, the scientific development of the development of a scientificmethodical apparatus for the synthesis of high-quality resonators with a developed spectrum for filter systems for telecommunication systems has been formulated. The renewal of the supplied science department will ensure the development of the system and the ability to induce the filtering system to reduce the attenuation in smoothies and the broadened area of operation, as well as allowing the development of telecommuting efficiency. On the basis of the spectral approach, the method for the synthesis of resonators on irregular transmission lines has been broken up. On the basis of different ways of stimulating the resonators in the proponation, the method allows one hour to synthesize the generation of colival systems for a given rise of resonance frequencies in a given frequency region and the value of the quality factor of the main type of colivan. It is shown that the spectral method is the most effective in the synthesis of non-uniform resonators with interruptions. The topology of strip and coaxial resonators has been broken down to provide the maximum quality factor.
Calhoun, Paul Jacob 1979. "Frequency synthesis using MEMS piezoelectric resonators." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28897.
Повний текст джерелаIncludes bibliographical references (p. 79).
(cont.) Ultimately, this thesis presents two approaches to frequency synthesizer design. The first uses frequency windows of approximately 200 MHz. The 800 MHz to 1 GHz matching network is presented in detail along with predicted performance capabilities across this frequency range. The second design implements matching networks with variable capacitors and a variable load impedance. CAD performance simulations validate the broadband switched array design concept, and represent a first step towards realizing a new, commercially viable RF MEMS oscillator and switched array frequency synthesizer. The views expressed in this article are those of the author and do not reflect the official policy or position of the United States Air Force, Department of Defense, or the U.S. Government.
This thesis explores the foundational issues in oscillator and frequency synthesizer design using an integrated MEMS piezoelectric resonator. It presents an original low phase-noise oscillator design and two frequency synthesizer designs using the emerging technology of Draper Laboratory's MEMS GHz-range resonator. The designs leverage the extremely small size and high Q of this MEMS resonator to develop integrable, energy efficient, low phase noise oscillators and frequency synthesizers. The circuits presented offer significant size and flexibility advantages over present designs, while promising exceptional performance. First, a 1 GHz frequency oscillator design is described incorporating the longitudinal mode bar (L-Bar) resonator with a SiGe bipolar junction transistor (BJT) in a one-port reflection topology. This design choice was made to minimize circuit complexity when later employed in a frequency synthesizer with a broadband array of switched resonators. Harmonic frequency matching is considered in a trade study between phase noise, efficiency, and circuit complexity. Performance was further enhanced using a novel approach for selecting the target static negative impedance looking into the transistor. This method modifies the transistor base current and matching networks in a manner that allows simultaneous optimization of phase noise and efficiency. The resulting oscillator has size and predicted performance characteristics that are unachievable using present technology. Second, the matching networks from the 1 GHz oscillator are altered to allow for oscillation over a frequency range selected by an array of switched resonators. The resulting frequency synthesizer is designed to operate in the range of 200 MHz to 1 GHz.
by Paul Jacob Calhoun.
S.M.
Hopcroft, Matthew A. "Temperature-stabilized silicon resonators for frequency references /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаОлійник, Ольга Юріївна. "Науково-методологічні засади віброчастотного контролю технологічних параметрів в умовах вібрації". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42235.
Повний текст джерелаDissertation for the degree of Doctor of Sciences (Technology), Specialty 05.11.13 – «Instruments and Methods of Control and compounds` composition determination». ‒ State Higher Educational Institution «Ukrainian State Chemical Technology University» of the Ministry of Education and Science of Ukraine, Dnipro, 2019. ‒ National Technical University «Kharkiv Polytechnic Institute» of the Ministry of Education and Science of Ukraine. The dissertation is devoted to solving the scientific and applied problem of increasing the reliability of the control of technological parameters (density, viscosity, force (pressure)) in a production environment through the development of new mathematical models and methods for determining technological parameters from the amplitude-frequency characteristics of the oscillatory environment of apparatuses, the use of new multiparameter vibration frequency converters with a universal characteristic and variable signal-to-noise ratio, as well as software development STV filtering noisy measurement information with unknown distribution laws. A vibrational frequency method has been developed for monitoring and measuring the density, viscosity, force (pressure) of gas-liquid media under industrial conditions using a measuring transducer with a tubular, cylindrical resonator, mathematical models of the amplitude-frequency characteristics of technological parameters in devices of various designs are obtained. Theoretical foundations have been developed for the design of non-metallic tubular flow resonators with a wide scope. A multifunctional vibration frequency converter has been developed for measuring density, viscosity, force (pressure) with a cylindrical resonator, which has a universal characteristic. Research work on the identification of distribution laws has been completed, an Kalman filtering algorithm has been developed for measuring information with increased noise, and the structure of a multidimensional control system for technological parameters with a system for diagnosing the shape of resonator vibrations; improved device for identifying the active state of the operator. Implementation of engineering developments of the thesis was carried out at the leading enterprises of the Dnieper and abroad.