Relevant bibliographies by topics / Coaxial resonator

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  2. Dissertations / Theses
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Academic literature on the topic 'Coaxial resonator'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Coaxial resonator"

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Xie, Yong Chao, Jin Yan Shi, and Xue Yong Ding. "Comparatively Study of Coaxial Waveguide and Open Coaxial Cavity." Advanced Materials Research 694-697 (May 2013): 1417–20. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.1417.

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In this paper, the computational formula of field distribution in a coaxial waveguide and the field distribution, resonant frequency and Q factors of open coaxial resonator are introduced. The S21 and the field profile of the TEM mode in a coaxial waveguide, and the field profile and E-field of the mode in a coaxial resonator is gained by the software CST microware studio. The truth that an open coaxial cavity is virtually a slow-varied section coaxial waveguide is gained.
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Tan, Biao, and Shu Bing Su. "Measurement of Permittivity of Ferroelectrics Using Coaxial Resonator." Applied Mechanics and Materials 109 (October 2011): 195–98. http://dx.doi.org/10.4028/www.scientific.net/amm.109.195.

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This paper presents a coaxial resonator technique applied for the measurement of the permittivity of ferroelectric thick film. A 1/4-wavelength coaxial resonator with appropriate dimensions were designed and made for measurements so that there is only TEM fundamental resonance in the interest frequency range. The permittivity may be extracted from the measured TEM fundamental resonant frequency in the resonator. The equivalent capacitance to the part between sample and open end of coaxial line is discussed, in which the boundary element numerical method was used for modeling the capacitance. The resonant frequency was measured using network analyzer and good experimental results were obtained.
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Aouidad, Hakim, Eric Rius, Jean-François Favennec, Alexandre Manchec, and Yann Clavet. "UHF second order bandpass filters based on miniature two-section SIR coaxial resonators." International Journal of Microwave and Wireless Technologies 8, no. 8 (September 2, 2015): 1187–96. http://dx.doi.org/10.1017/s1759078715001300.

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This paper describes a concept of stepped impedance resonators (SIR) built from two coaxial structures fitted inside one another. The resonator is built out of a succession of two coaxial sections in cascade, where the ground conductor of the first one is the central core of the next, or vice-versa. An advantageous property of SIR is that they allow a substantial reduction in size, while keeping away the first harmonic and without strongly degrading the quality factor. After describing the theoretical behavior of the resonator, we will then present the specific properties of this approach in second order filter, conceived, and realized in the UHF band. With this example, we will also address flexibility and tunability aspects, which are the other potentially useful properties of the structure. Measurements and simulations are presented and discussed. The architecture resembles a set of two Russian dolls that fit inside one another.
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Borodaev, V. A., Yu I. Konyaev, V. F. Kravchenko, I. E. Pedchenko, and Yu A. Prokopchuk. "A coaxial resonator of special shape." Measurement Techniques 35, no. 10 (October 1992): 1197–200. http://dx.doi.org/10.1007/bf00977483.

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Xie, Yong Chao. "Effect of Parallel Misalignment in a 9GHz Open Coaxial Resonator." Advanced Materials Research 753-755 (August 2013): 968–72. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.968.

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The effect of inner-rod parallel misalignment in a 9-GHz open coaxial resonator is studied by means of the software CST microwave studio. Results show that the parallel misalignments between the inner rod and outer wall have substantial influences on the field profile, resonant frequency, and Q factors of an open coaxial resonator. So in the practical of engineering applications, we should try to avoid the occurrence of eccentric between the inner rod and outer wall due to technological factors.
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Hameed, Musab, Gaobiao Xiao, Lina Qiu, Can Xiong, and Tayyab Hameed. "Multiple-Mode Wideband Bandpass Filter Using Split Ring Resonators in a Rectangular Waveguide Cavity." Electronics 7, no. 12 (November 26, 2018): 356. http://dx.doi.org/10.3390/electronics7120356.

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This paper presents a simple split ring resonator excitation to realize a multi-mode wideband bandpass filter in a rectangular waveguide cavity. The proposed resonator employs two rectangular split rings attached with two coaxial probes extended into the cavity to excite two resonant modes, unlike the conventional cavity resonators which employ conductive cylinders in the cavities to achieve the same results. A hybrid magnetic (HM) mode and a hybrid electric (HE) mode are the two hybrid modes excited to realize the wideband bandpass filter. The filter operates at 2.5 GHz center frequency with 53% fractional bandwidth. Finally, the prototypes of a second and a fourth order filter are fabricated for results validation. Measured results are in good agreement with the simulated ones.
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Xie, Yong Chao, and Tong Liu. "Effect of Oblique Misalignment in a 9GHz Open Coaxial Resonator." Applied Mechanics and Materials 392 (September 2013): 461–65. http://dx.doi.org/10.4028/www.scientific.net/amm.392.461.

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The effect of inner-rod oblique misalignment in a 9-GHz open coaxial resonator is studied by means of the software CST microwave studio. Results show that the oblique eccentric between the inner rod and outer wall have substantial influences on the field profile, resonant frequency, and Q factors of an open coaxial resonator. And the oblique misalignment has more serious effect than the parallel misalignment. So in the practical of engineering applications, we should try to avoid the occurrence of eccentric between the inner rod and outer wall during to technological factors.
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Zhan, Jin-Song, Shi-Wei Dong, Li-Ming Gong, Shao-Feng Dong, Xiao-Long Chen, and Jia-Li Wang. "A MULTI-EVANESCENT-MODE COAXIAL CAVITY RESONATOR." Progress In Electromagnetics Research 144 (2014): 193–200. http://dx.doi.org/10.2528/pier13112902.

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Michail, G. Ch, and N. K. Uzunoglu. "Accurate Design of Coaxial Cavity Resonator Filters." Journal of Electromagnetic Waves and Applications 18, no. 8 (January 2004): 1119–31. http://dx.doi.org/10.1163/1569393042955388.

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Barrall, G. A., Y. K. Lee, and G. C. Chingas. "Radial RF Imaging Using a Coaxial Resonator." Journal of Magnetic Resonance, Series A 106, no. 1 (January 1994): 132–34. http://dx.doi.org/10.1006/jmra.1994.1015.

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Dissertations / Theses on the topic "Coaxial resonator"

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Maas, Susan. "Coaxial resonator filters." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18067.

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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.
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Bakam, 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.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2017.
RF 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)
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Muhammad-Ahmad, Ma. "Resonant cavity method for broadband dielectric measurements." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6671/.

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The project investigates the Cavity Perturbation Method (CRM) and design of a coaxial resonator covering a wide frequency band from 2.5 to 11.5 GHz. Using the published analyses for coaxial cavities, original theoretical analysis of Cavity Perturbation Method for TEM coaxial cavity was carried out by the author. Using similar approach, the H(_011) cylindrical cavity was analyzed. The deliberate objective of the method was to produce a wide band technique since there are none available at present. The method then examines the possibility of employing the coaxial cavity as an important and necessary measuring device for dielectric measurements using CPM. It was the aim in the investigations to state clearly what assumptions were made so that the accuracy of the calculated results could be assessed. A new measurement technique, using a Sweep Generator/ Spectrum Analyzer Assembly (SG/SA) was introduced. The technique is based on very precise measurements of the changes in cavity Q and its resonant frequency, displayed on Spectrum Analyzer, when the test sample of the material is inserted. Because the main objective of the project is the method of measurements, the assessment of its validity and accuracy was fully discussed. Measurements were carried out on fifteen materials of various types of ceramics over the frequency range of interest. These materials were used mainly for the assessment of the validity and accuracy of the new Sweep Generator/Spectrum Analyzer Assembly technique, and also a test of the capability of the constructed broadband coaxial cavity to be used for dielectric measurements. The well-known Bridge and Q-meter methods, were employed initially to provide the low frequency values for the materials as reference. An attempt has also been made to justify the validity of the universal law on those materials. Additional work not directly related to the main project has been carried out on Curie temperature measurements. The object was to develop a simple and reliable method using the Gouy balance technique.
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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.

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Thesis (M.S.)--West Virginia University, 2000.
Title from document title page. Document formatted into pages; contains xii, 119 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 106-107).
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Sam, Lwazi. "The design of a coupled co-axial resonator filter for low earth orbit satellites working at microwave frequencies." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53095.

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Thesis (MScEng)--University of Stellenbosch, 2002.
ENGLISH ABSTRACT: Keywords: Coupled resonator filters, Co-axial line resonators, Basic Coupling Design, Co-axial resonator filter The study of the basic dynamics of filters, with the emphasis on coupled resonator filters, is presented. Special attention is paid to the synthesis of doubly terminated coupling matrices using the Darlington method. Due to restrictions placed on the filter by the equivalent circuit used, a coupling matrix reduction is applied to the resulting coupling matrix. An investigation is performed on A/2 co-axial line resonators, with the emphasis on rectangular co-axial line resonators with a round center conductor. The basic definition of the coupling coefficient is revisited and it is calculated using the method based on Bethe's theory and Cohn's experimental work. A 4th-order co-axial resonator filter operating at 3 GHz is designed using the theory outlined in this thesis. The measured response is in good agreement with the theory in terms of the center frequency, but disagree in terms of the coupling coefficient, bandwidth and Q-factor. The reasons for this, as well as suggestions for improving the accuracy of the parameters mentioned, are given.
AFRIKAANSE OPSOMMING: Sleutelwoorde: Gekoppelde resoneerder filters, Ko-aksiale lyn resoneerders, Basiese Koppeling Ontwerp, Ko-aksiale resoneerder filter Die studie van die basies dinamika van filters, met die klem op gekoppelde resoneerder filters, is voorgelê. Spesiale aandag is gegee aan die sintese van dubbelbelaste koppel matrikse met die gebruik van die Darlington metode. As gevolg van die beperkings wat op die filter geplaas word deur die gebruik van die ekwivalent stroombaan, word 'n koppel matriks vermindering gebruik. 'n Ondersoek is gedoen op A/2 ko-aksiale lyn resoneerders, met die klem op reghoekige ko-aksiale lyn resoneerders met 'n ronde binnegeleier. Die basiese definisie van die koppel koëffisiënt is hersien en dit is bereken met die gebruik van die metode wat baseer is op Bethe se teorie en Cohn se experimentele werk. 'n 4de-orde ko-aksiale resoneerder filter wat opereer by 3 GHz is ontwerp met die gebruik van die teorie wat in hierdie tesis gaskets word. Die gemete weergawe is in goeie ooreenkoms met die teorie in terme van die senter frekwensie, maar verskil in terme van die koppel koëffisiënt, bandwydte en Q-faktor. Die rede hiervoor, as ook voorstelle vir die verbetering van die akkuraatheid van die parameters wat genoem is, IS gegee.
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Llerena, Castro Oscar Enrique 1984. "Study of a compact microwave ceramic coaxial resonator filter : Estudo de um filtro compacto para microondas feito com ressonadores coaxias ceramicos." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259187.

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Orientador: Hugo Enrique Hernandez-Figueroa
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-26T16:04:15Z (GMT). No. of bitstreams: 1 LlerenaCastro_OscarEnrique_M.pdf: 5834212 bytes, checksum: f007c788f1123ca923e5f860548252f0 (MD5) Previous issue date: 2014
Resumo: Os filtros passa-faixa feitos com ressonadores coaxiais cerâmicos são um tipo de tecnologia de filtro que fornece características de alta performance como a alta seletividade, ótimo desempenho em aplicações de alta potência, excelente rejeição, baixa perda de inserção na banda passante, etc. , e dado que os ressonadores são feitos de materiais de alta constante dielétrica consideravelmente, consequentemente, todas as características elétricas mencionadas anteriormente são compactadas em uma estrutura protegida o qual faz que este tipo de filtros sejam adequados para aplicações onde precisam-se de dispositivos de tamanho pequeno. A parte mais difícil no momento de projetar este tipo de filtros é encontrar as dimensões certas da estrutura, sejam as alturas dos ressonadores ou as dimensões da estrutura dos capacitores de acoplamento. Esta tese presenta um estudo feito neste tipo de filtro e propõe um procedimento analítico-empírico com formulas para projeção para facilitar a construção do arranjo de ressonadores e a estrutura dos capacitores de acoplamento. Este procedimento pode ser extrapolado para filtros passa-faixa com um maior número de ressonadores. As formulas de projeção permitem uma transição fácil do modelo circuital ao modelo eletromagnético do filtro. Isto deve-se com as formulas é fácil calcular os comprimentos dos ressonadores e os valores das capacitâncias requeridas para acoplar corretamente os ressonadores. A comparação entre as simulações no modelo circuital e o entorno eletromagnético mostram que as formulas de projeção propostas são uma ótima primeira aproximação para a projeção deste filtro
Abstract: Bandpass filters made with ceramic coaxial resonators are a kind of filter technology that provides high performance features like high selectivity, high power handling, excellent rejection, low passband insertion loss, etc. and given that the resonators are made of with materials of high dielectric constant it considerably reduces their size, consequently, all the electric characteristics mentioned before are "compacted" in a small shielded structure which make these filters suitable for applications where small sized devices are a necessity. The most difficult task when projecting this kind of filters is to find the correct dimensions of the structure, either the length of the resonators or the dimensions of the coupling capacitors structure. This thesis presents a study on this type of filter and propose an analytical-empirical procedure with design formulas to facilitate construction of the resonators array and the coupling capacitors structure. This procedure can be extrapolated to bandpass filters with a greater number of resonators. The design formulas allow an easy transition from the circuital model to the electromagnetic model of the filter. This is because they easily allow to compute the length of the resonators and the value of the capacitances required for a correctly resonators coupling. The comparison between the simulations in the circuital and the electromagnetic environment show that the proposed design formulas are a good first approximation for this filter design
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
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Tuhkala, M. (Marko). "Dielectric characterization of powdery substances using an indirectly coupled open-ended coaxial cavity resonator." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526205595.

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Abstract The main objective of this thesis was to research and develop a sensitive characterization method for dielectric powdery substances which could be utilized in various industrial and research fields. With modern electromagnetic simulation tools and the presented experimental measurements, the characterization of dielectric powders using an indirectly coupled open-ended coaxial cavity resonator operating in TEM mode at 4.5 GHz was found to have potential. The modelling and the experimental measurement results of commonly used dielectric powders revealed that, from the nine classical mixing rules, it was possible to derive reliable inclusion permittivity values when using the properties of the perturbed resonator and the Bruggeman symmetric and the Looyenga mixing theories. In addition, the determination accuracy of the inclusion permittivity was found to be greatly improved with the correction factor included into the previously presented permittivity equation of the quarter wave coaxial resonator. Determination of the dielectric losses was found to be reliable when using the differences between the perturbed and unperturbed resonator and the general mixing model equation. The sensitivity of the characterization method was researched with both humidity exposed and surfactant treated modified SiO2, Al2O3 and ZrO2 powders. Experimental results showed that the effect of adsorbed water on the particles was most pronounced when measuring the dielectric losses of the inclusions. Furthermore, a clear correlation with the theory of the general mixing model was found. Thus, in addition to the changed dielectric properties between dry and humidity exposed powders, it was also possible to determine the moisture content with reasonable accuracy. This correlated well with the traditional, mass based, determination. Stearic acid coating of the particles induced only a small change in inclusion permittivity but a notable change in dielectric losses. Unlike the cases with the larger particle sized SiO2 and Al2O3, the dielectric loss of ZrO2 inclusions, with stearic acid coating, was decreased significantly from 6.2 × 10-3 to 3.8 × 10-3. When characterizing magnesium and calcium titanate composite powders, with CaTiO3 molar ratios of 0.0, 0.02, 0.05 and 0.1, the method was found to have good sensitivity and accuracy. Additions of CaTiO3 exhibited a clear increase in net inclusion permittivities from 13.4 up to 14.9 and in dielectric loss tangents from 7.1 × 10-3 up to 8.5 × 10-3. In addition, a good correlation was found in the theoretical determination of the CaTiO3 molar ratios using the resonator measurement results and the general mixing model. The characterization method was proved to be capable of measuring the dielectric properties and detecting even very slight changes in the powders. Thus, the method could be utilized in various types of powdery material characterization, for example, in the analysis and quality control of different composite powders
Tiivistelmä Väitöstyön päätavoitteena oli tutkia ja kehittää herkkä jauhemaisten eristemateriaalien karakterisointimenetelmä, jota voitaisiin hyödyntää usealla teollisuuden ja tutkimuksen alueella. Hyödyntäen nykyaikaisia sähkömagnetiikan simulointityökaluja sekä kokeellisia mittauksia, havaittiin TEM -moodissa 4,5 GHz taajuudella toimivan avoimen epäsuorasti kytketyn koaksiaalionteloresonaattorin soveltuvan karakterisoimaan eristejauheita. Sähkömagneettinenmallinnus yhdessä yleisesti käytettyjen eristejauheiden kokeellisten mittausten kanssa osoitti, että partikkelin permittiivisyysarvot voitiin johtaa luotettavasti. Tällöin käytettiin näytemateriaalilla täytetyn resonaattorin ominaisuuksia, sekä yhdeksästä vertaillusta klassisesta sekoitusyhtälöstä Bruggeman symmetristä ja Looyengan sekoitusteorioita. Tämän lisäksi tarkkuutta voitiin parantaa huomattavasti lisäämällä korjauskerroin aikaisemmin julkaistuun neljännesaalto-koaksiaaliresonaattorin permittiivisyyden määrittävään yhtälöön. Eristehäviöiden määrittäminen havaittiin luotettavaksi, kun käytettiin mitattavalla materiaalilla muutetun ja tyhjän resonaattorin ominaisuuksien eroja, sekä general mixing model -yhtälöä. Karakterisointimenetelmän herkkyys tutkittiin ilmankosteudelle altistetuilla, sekä pintakäsittelyllä muutetuilla SiO2, Al2O3 ja ZrO2 -jauheilla. Mittaustulokset osoittivat, että partikkelin pinnalle adsorpoituneen veden vaikutus oli kaikkein korostunein, kun mitattiin partikkelien eristehäviöitä. Tämän lisäksi havaittiin myös selkeä korrelaatio general mixing model -teorian kanssa. Näin ollen muuttuneiden eristeominaisuuksien määritysten lisäksi voitiin määrittää jauheen kosteussisältö riittävällä tarkkuudella. Tulokset korreloivat hyvin perinteisen massaeroihin perustuvan määrittämisen kanssa. Partikkelien pinnoitus steariinihapolla aiheutti ainoastaan pienen muutoksen permittiivisyyteen mutta merkittävän muutoksen eristehäviöihin. Toisin kuin suuremman partikkelikoon SiO2:lla ja Al2O3:lla ZrO2 -partikkelin eristehäviö laski huomattavasti steariinihappopinnoituksen jälkeen, 6,2 × 10-3:sta 3,8 × 10-3:een. Karakterisoitaessa magnesium- ja kalsiumtitanaattikomposiittijauheita käyttämällä CaTiO3 -moolisuhteita 0,0, 0,02, 0,05 ja 0,1 menetelmällä havaittiin olevan hyvä herkkyys ja tarkkuus mitattavan materiaalin muutoksille. CaTiO3 -määrän lisäykset aiheuttivat selkeän nousun partikkelien kokonaispermittiivisyyksissä, joka kasvoi 13,4:sta 14,9:ään, sekä häviötangentissa, joka kasvoi 7,1 × 10-3:sta aina 8,5 × 10-3:een. Tämän lisäksi resonaattorin mitattuihin ominaisuuksiin sekä general mixing model -yhtälöön perustuvan teoreettisen määrityksen havaittin korreloivan hyvin CaTiO3 -moolisuhteisiin. Karakterisointimenetelmän osoitettiin soveltuvan eristeominaisuuksien mittaukseen sekä havaitsemaan jopa erittäin pienet muutokset jauheiden eristeominaisuuksissa. Menetelmää voitaisiin hyödyntää usean tyyppisissä jauhemateriaalien ominaisuuksien määrityksissä, kuten esimerkiksi erilaisten komposiittijauheiden analysoinnissa ja laaduntarkkailussa
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Kemppinen, E. (Esa). "Determination of the permittivity of some dielectrics in the microwave and millimetre wave region." Doctoral thesis, University of Oulu, 1999. http://urn.fi/urn:isbn:9514251954.

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Abstract In the first part of this study, determination of the dielectric properties of the low loss microwave ceramic material, barium nonatitanate (Ba2Ti9O20), around 1 GHz is discussed. The structures under test were coaxial resonators, the cores of which were made of barium nonatitanate and the metallization was realised by thick film silver. The measured value of the real part of the relative dielectric constant was εr = 37 and that of the loss tangent was tan σ = 0.00014. The change of the resonance frequency of the coaxial resonators with temperature, in the range -20 … +80 C, was 4 ppm/ C. In addition, realisation of compact interdigital and comb-line bandpass filters was demonstrated for the 900 MHz mobile phone band. Besides Ba2Ti9O20, Ba(Sm,Nd)2Ti5O14 ceramic material with a dielectric constant of εr = 78 was also employed in order to improve the miniaturisation. The volume of the smallest filter was 2 cm3 and the weight was 9 g. In the second part of this study, various measurement methods have been demonstrated to determine the real part of the relative permittivity of FR4 fibreglass circuit board. Test structures were straight asymmetric open-circuited strip lines. It was found that the real part of the relative permittivity decreased slightly with frequency. At 0.72 GHz and 4.5 GHz, εr values of 4.3 and 4.1, respectively, were measured. All the characterisation methods used gave consistent values for εr, and electromagnetic simulators were used to verify the results. In the third part of this study, the structures under test were microstrip or strip line transmission lines, the S parameters of which were measured by using on-wafer measurement techniques. It was found that the insertion loss of the 10 mm long etched Cu microstrip was slightly less than that of the Ag microstrips which were manufactured by etching and gravure offset printing techniques, respectively. The performance of the Ag microstrips was, however, similar. In addition, a theoretical basis was established for the determination of εr of the dielectric substrate and the attenuation coefficient of the transmission lines under test. The calculations were based on signal flow diagrams. The method was applied to determine the dielectric and loss properties of a commercial, Kyocera, Japan, LTCC (Low Temperature Cofired Ceramic) material up to 50 GHz. The measured value of the real part of the relative permittivity was εr = 5.7, and the loss tangent was approximately tan σ = 0.003. The essential idea behind the studies reported in this thesis was twofold. First, the studies aimed at characterising dielectric media which find usage in the realisation of UHF, microwave or millimetre wave circuits. Second, the studies aimed to obtain data of immediate value in practical design work. For this reason, the structures under test were transmission lines having extensive usage in practical high frequency circuit design.
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9

Wells, Colin G. "Analysis of shielded rectangular dielectric rod waveguide using mode matching." University of Southern Queensland, Faculty of Engineering and Surveying, 2005. http://eprints.usq.edu.au/archive/00001524/.

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The limit of current technology for mobile base station filters is the multimode filter, in which each cavity supports two (or possibly three) independent degenerate resonances. Shielded dielectric resonators with a rectangular cross-section are useful in this application. In the design of these filters, manufacturers are using software packages employing finite element or finite difference time domain techniques. However, for sufficient accuracy these procedures require large numbers of points or elements and can be very time consuming. Over the last decade research using the mode matching technique has been used to solve this kind of difficulty for various types of filter design and waveguide problems. In this thesis a mode matching method and computer program is developed to calculate the propagation coefficients and field patterns of the modes in a shielded rectangular dielectric rod waveguide. Propagating, complex, evanescent and backward wave modes are included and the work shows the presence of a dominant mode, and other fundamental modes, not previously identified. The effect of the shield proximity on the propagation characteristics and mode spectrum is investigated, together with the limitations on the accuracy of the mode matching method. In addition, the fields within the shielded rectangular dielectric rod waveguide, are used to calculate the attenuation coefficient of the dominant and fundamental modes. The influence on the attenuation coefficient of the proximity of the shield to the rod is also evaluated for these modes and limitations on accuracy are discussed. The calculated numerical results for the propagation and attenuation coefficient values are verified by measurement. The propagation coefficients results are typically within 2% of those measured. Verification of the attenuation coefficient results is achieved by comparing calculated and measured Q at the resonant frequencies of a number of shielded rectangular dielectric rod resonators. The difference between calculated and measured Q values is on average less than 4%. In the absence of a full solution of the shielded rectangular dielectric rod resonator, these results provide useful design information for this structure. In addition, the work reported in this thesis provides a basis for a full electromagnetic solution of this type of resonator. This would encompass the cubic dielectric resonator in a cubical cavity.
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Kwinana, Phumezo M. "A T-resonator technique for aperture plane admittance parameters of electrically short RF monopoles." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1501.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.
This thesis focuses on the coaxial-microstrip T-resonator measurement technique to determine the aperture plane capacitance and radiation resistance of electrically short monopoles above a finite ground plane at Radio Frequencies. The determination of these impedance parameters is of interest as they are needed in the Thévenin equivalent circuit of the monopole to establish the relationship between the monopole, the electromagnetic field within which it is immersed, and its surrounding medium properties. Electromagnetically short monopoles are used in various applications such as in permittivity and biomedical measurement techniques and near-field metrology. The coaxial-microstrip device allows the measurement of transmission coefficient nulls when connected to the network analyser. By measuring the frequency shift in transmission null points and analysing the results, the capacitance of short monopoles of various lengths can be obtained. The radiation resistance of the monopole can also be determined by comparing the depth of transmission coefficient nulls points at various resonant frequencies. Monopoles ranging from flush-mounted to various sizes of protruding centre conductors, both bare and insulated, are investigated in the frequencies ranging from 45 MHz to 3 GHz. The experimental results compare well with FEKO numerical predictions at the ranges where this technique is applicable. The technique is however not applicable near and beyond the resonant frequency of the monopole where it is considered to be electrically long. Measurements to obtain monopole impedance parameters were conducted by connecting the device to the HP 8510C Network Analyser. To enhance accuracy, the Network Analyser was calibrated using a high quality calibration kit with precisely defined standards. The technique used was found to accurately yield capacitances in the range of 0.0211 to 1 pF and radiation resistances in the range of 0.9245 to 12.1 Ohms. These results were obtained for monopoles of length 0.0062 < h/l < 0.24. Results from literature, viz. W.R Scott, R.W.P. King and L.J. Cooper, show radiation resistance in the ranges: 2.5 to 35 Ohms (0.079 < h/l < 0.22), 1.26 to 74.08 Ohms (0.026 < h/l < 0.28) and 5.59 to 74.98 Ohms (0.1 < 0.28) for electrically short monopoles. The results of this work are compared with those in the literature and show variations of less than 6%. A technique capable of accurately measuring capacitance and radiation resistance of the monopole at various lengths of protruding centre conductor has been developed. The capacitance for a flush probe compares very well (agreement is less than 6%) when compared with those obtained by the previous researchers. The technique is capable of yielding accurate results radio frequencies in the challenging low radiation resistance range around 1 Ohm.
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Books on the topic "Coaxial resonator"

1

Kelly, Brendan. Radio frequency oscillator design using coaxial ceramic resonators. [s.l: The Author], 1992.

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Ching, Marcel Lowe. A differential oscillator based on an external coaxial resonator. 2001, 2001.

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Book chapters on the topic "Coaxial resonator"

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Hou, Shenyong, Sheny Yu, Qixiang Zhao, and Youwei Yang. "Research on Eigen Value of Coaxial Resonator with Inner-Outer Corrugation." In Proceedings of the 6th International Asia Conference on Industrial Engineering and Management Innovation, 271–77. Paris: Atlantis Press, 2015. http://dx.doi.org/10.2991/978-94-6239-148-2_27.

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Sirci, Stefano, Jorge D. Martinez, Miguel Angel Sanchez-Soriano, and Vicente E. Boria. "Advances in planar coaxial SIW resonator filters design." In Advances in Planar Filters Design, 59–87. Institution of Engineering and Technology, 2019. http://dx.doi.org/10.1049/sbew535e_ch3.

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Ginzburg, N. S., N. Yu Peskov, A. S. Sergeev, I. V. Konoplev, K. Ronald, A. D. R. Phelps, and A. W. Cross. "On the mechanism of high selectivity of two-dimensional coaxial Bragg resonators." In Free Electron Lasers 2003, 78–82. Elsevier, 2004. http://dx.doi.org/10.1016/b978-0-444-51727-2.50024-9.

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Conference papers on the topic "Coaxial resonator"

1

Dong, Yuhe, Liu Xiao, and Yaogen Ding. "Coupling of Coaxial Cavity Resonator of Klystron to Coaxial Line." In 2007 IEEE International Vacuum Electronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/ivelec.2007.4283244.

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Suzhen Mei and Mei Li. "Design of the coaxial resonator diplexer." In 2011 International Conference on Computer Science and Service System (CSSS). IEEE, 2011. http://dx.doi.org/10.1109/csss.2011.5972090.

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Schoebel, Joerg, Carsten Monka, and Jan Fahlbusch. "Direct-coupled resonator filters based on foreshortened coaxial transmission line resonators." In 2018 German Microwave Conference (GeMiC). IEEE, 2018. http://dx.doi.org/10.23919/gemic.2018.8335045.

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Bilous, R., and A. Motornenko. "H-Type Oscillations in Waveguide-Coaxial Resonator." In 2006 16th International Crimean Microwave and Telecommunication Technology. IEEE, 2006. http://dx.doi.org/10.1109/crmico.2006.256106.

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Martynyuk, S. P., A. P. Motornenko, I. G. Skuratovsky, and O. A. Khazov. "TEM-Type Oscillations in Waveguide-Coaxial Resonator." In 2007 17th International Crimean Conference - Microwave & Telecommunication Technology. IEEE, 2007. http://dx.doi.org/10.1109/crmico.2007.4368830.

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Mingshan, Yang, Zhang Yufeng, and Niu zhongxia. "Design for Absorptive Coaxial Transmission Line Coaxial Cavity Resonator Microwave Amplitude Equalizer." In TENCON 2006 - 2006 IEEE Region 10 Conference. IEEE, 2006. http://dx.doi.org/10.1109/tencon.2006.343683.

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Zakaria, Z., I. C. Hunter, and A. C. Guyette. "Design of coaxial resonator filter with nonuniform dissipation." In 2008 IEEE MTT-S International Microwave Symposium Digest - MTT 2008. IEEE, 2008. http://dx.doi.org/10.1109/mwsym.2008.4632909.

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Motornenko, A. P., I. G. Skuratovskiy, and S. P. Martynyuk. "Tuning of electric parameters of waveguide coaxial resonator." In Telecommunication Technology" (CriMiCo 2008). IEEE, 2008. http://dx.doi.org/10.1109/crmico.2008.4676484.

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Bilous, R. I., A. P. Motornenko, O. I. Khazov, I. G. Skuratovskiy, and A. S. Shakhova. "Waveguide-coaxial resonator with a wide frequency tuning." In 2016 9th International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves (MSMW). IEEE, 2016. http://dx.doi.org/10.1109/msmw.2016.7537997.

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Sh-Asanjan, Desireh, and Raafat R. Mansour. "A novel coaxial resonator for high power applications." In 2014 44th European Microwave Conference (EuMC). IEEE, 2014. http://dx.doi.org/10.1109/eumc.2014.6986428.

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Reports on the topic "Coaxial resonator"

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Pozdeyev, E., J. Brandon, N. Bultman, X. Rao, R. York, and Q. Zhao. Report on Design, Development, and Characterization of a Coaxial Resonator Based Single-gap Gridless Multiharmonic Buncher. Office of Scientific and Technical Information (OSTI), February 2013. http://dx.doi.org/10.2172/1073065.

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