Dual-Mode Dielectric Resonator Loaded Cavity Filters

Fiedziuszko, S.J.

doi:10.1109/tmtt.1982.1131253

Cited by 256 publications

(59 citation statements)

References 12 publications

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“…Using DRs in this work allows for bridging the recent studies on below cut-off transmission in waveguides loaded with SRRs with earlier studies conducted in 60-80 s on filtering by waveguides filled with DRs. [30][31][32] DRs should be advantageous for contemporary below cut-off applications as they demonstrate low loss, support multiple electric/magnetic-type resonance modes and could be used for obtaining both forward and backward waves in various bands at waveguide miniaturization. 33 In addition, the unique environment of below cut-off waveguide is used in this work to quantitatively characterize the strength of coupling between DRs in arrays at various resonances and to determine the equivalent circuit parameters of DRs, which serve as important MM constituents.…”

Section: -mentioning

confidence: 99%

Effects of inductive waves on multi-band below-cut-off transmission in waveguides loaded with dielectric metamaterials

et al. 2014

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Unusual backward and forward wave propagation in below cut-off waveguides loaded with dielectric metamaterials comprised of linear arrays of dielectric resonators (DRs) has been investigated by using theoretical, numerical, and experimental methods. Transmission bands were shown to correspond to three lowest resonances in arrays and were analyzed by using the concepts of magneto- and electro-inductive (MI and EI) waves describing the transfer of resonance excitation along the chains of coupled resonators. Equivalent circuit models (ECMs) have been constructed to describe MI and EI wave propagation and to obtain the dispersion diagrams. Good agreement between the obtained data and the results of full-wave simulations, theoretical calculations, and experiments provided an opportunity to determine coupling coefficients characterizing interaction between DRs in arrays at various resonances. It was shown that ripples observed in below cut-off transmission bands are transmission resonances caused by Fabry-Perot oscillations of inductive waves at impedance mismatch at the array ends. Fitting the transmission spectra for MI/EI waves in arrays, calculated by using the Transfer Matrix Method to the spectra obtained by using full-wave simulations/measurements, allowed for determining the ECM parameters to fully characterize the DR array properties.

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Section: -mentioning

confidence: 99%

Effects of inductive waves on multi-band below-cut-off transmission in waveguides loaded with dielectric metamaterials

et al. 2014

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“…These filters will thus have to have a very low band and be very selective to maximize the number of channels on the useful band. Furthermore, the undulation in the band has to remain very low to avoid a modulation live as a parasite of the amplitude [5][6][7]. An IMUX contains so many filters as channels.…”

Section: The Multiplexer Of Entrancementioning

confidence: 99%

Study of New Planar Resonator’s Topologies Little Perceptible in Variations of Substratum’s Height

Zrigui

Zenkouar

Bri³

2012

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The mobile communication (radio, mobile, satellite telephony…) insert band filters which are required to comply with stringent pass-band characteristics concerning the selectivity, the group delay, the insertion losses and the mass and volume. The mass and volume of payload electronic equipment is a significant contributor to the overall cost of space systems. Within this framework, many improvements were made in the design of filters and multiplexers which represent a considerable portion of the overall satellite payload. The High Temperature Superconducting (HTS) planar technology permits to realize compact size filtering devices. Moreover, it could also provide a superior performance not attainable by any other technology. However, not controllable parameters in the manufacturing processes (indistinctness of the engraving, the not uniformity of substratum thickness) do not allow to obtain a precision on the echo's frequency and to keep a high quality factor. So, it is necessary to use method to tune the center frequency of filters after the fabrication or to study new resonator topologies which present lower sensitivity to LAIO 3 substrate thickness. This last point is the object of this article.

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“…Clear top-coat nail polish 18 was employed as an electrical insulator and glue because the acrylates copolymer contents are empirically known to retain material integrity under cryogenic conditions. [4, 15, 30] Nail polish was applied over the soldered connection points between the temperature sensor leads and magnet wire to ensure electrical insulation from the Cu platform.…”

Section: Electrical Isolationmentioning

confidence: 99%

“…19 18 Revlon 950 Extra Life TM 19 Results of tests with BS2 removed indicated that the thin film may have sourced thermal energy into BS2 when making contact through the nail polish layer.…”

Section: Electrical Isolationmentioning

confidence: 99%

Design and Prototyping of an Antenna-Coupled Cryotron

Jensen¹

2000

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Grid-scale integration of renewable energy sources and smart grid devices has created new demands in flexible power conversion. State-of-the-art semiconductor power switches present limitations in power handling capability, as well as forward and reverse breakdown voltages. Superconducting materials are a viable alternative due to their robustness against high ampacities, large electric fields and abrupt changes in power flow. This work pays focus to material testing and apparatus design for an antenna-coupled cryotron (ACC), which is a superconducting power switch.Design, fabrication and testing are examined for a longitudinal resonant cavity, paired with monopole transmit and modified slot receive antennae. These couple radio frequency (RF) energy into superconducting thin film niobium (Nb) carrying high current densities (∼ 105A/cm 2 ), thereby creating an antenna-coupled cryotron.Induced electromagnetic field effects at the receive antenna alter superconductive fluid dynamics. The theorized quality in manipulating this mechanism is a rapid normal-conductivity transition (µs), which affects a switch "off" state. Functional evaluation of the device as a waveguide revealed evanescent mode resonance at frequencies below the waveguide cut-off of ∼ 18GHz. The thin film Nb was deposited on a quartz dielectric, which penetrated the waveguide and supported evanescent resonances within the structure.i Altered resistivity and critical transition-point properties emerged from device testing at applied RF. When the Nb film temperature-dependent coherence length was comparable to its thickness, perpendicular magnetic field application generated an Abrikosov vortex state, energetically favoring a mixed domain condensate. Interaction of the magnetically-induced flux vortex lattice with Lorentz current forces gave rise to resistive changes within the metal.Three resistive transition mechanisms developed: a latch to normal state resistance, attributed to cooper-pair destruction avalanche induced near critical transition points; a small reversible increase in resistance (∼ mV ), arising from flux-flow within an intermediate state at peak resonance; as well as temporal alterations in superfluid dynamics from disequilibrium in the quasi-particle population. The RF-induced superfluid effects were observable in separate terms of electric and thermodynamic fluctuations.Motivation for this work is the eventual design of a high voltage, high current and low cost power switch, able to function where existing semiconductor technology fails.Concentration is paid to the fundamental theory, physics and methodology in conceptual testing and design of prototype ACCs. Assessment focuses on preliminary findings and concludes with next stage design requirements.ii Acknowledgements I would like to gratefully acknowledge the collaborators on this project: Robert Bass 1 , AaronDatesman, Aric Datesman and Arthur Lichtenberger; as well as thesis committee members:Richard Campbell and Branimir Pejcinovic. It has been an honor to participate ...

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Dual-Mode Dielectric Resonator Loaded Cavity Filters

Cited by 256 publications

References 12 publications

Effects of inductive waves on multi-band below-cut-off transmission in waveguides loaded with dielectric metamaterials

Effects of inductive waves on multi-band below-cut-off transmission in waveguides loaded with dielectric metamaterials

Study of New Planar Resonator’s Topologies Little Perceptible in Variations of Substratum’s Height

Design and Prototyping of an Antenna-Coupled Cryotron

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