Superconducting nonreciprocal devices for microwave systems

Denlinger, E.J.; Paglione, R.W.; Kalokitis, D.; Belohoubek, E.; Piqué, Alberto; Wu, Xinyu; Venkatesan, T.; Fathy, Aly E.; Pendrick, V.; Green, S.; Mathews, Scott A.

doi:10.1109/75.165640

Cited by 19 publications

(5 citation statements)

References 5 publications

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“…The feasibility of applying high-temperature superconductor (HTS) technology to nonreciprocal microwave devices has been demonstrated in the form of isolators and circulators. They are used widely to achieve stability, reliability, and reproducibility in microwave circuit performance [21]. Pure YBa 2 Cu 3 O 7−x ceramics normally display superconductivity and metallic conductivity below and above the critical temperature of the superconductor c respectively.…”

Section: Introductionmentioning

confidence: 99%

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Attenuation in a Cylindrical Left Handed Material (LHM) Wave-Guide Structure

Mousa¹

2012

OPJ

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This paper tackles the wave attenuation along with a cylindrical waveguides composed of a left Handed material (LHM), surrounded by a superconducting or metal wall. I used the transcendental equations for both TE and TM waves. I found out that the waveguide supports backward TE and backward TM waves since both permittivity and magnetic permeability of LHM are negative. I also illustrated the dependence of the TE and TM wave attenuation on the wave frequency and the reduced temperature of the superconducting wall (T/T<sub>c</sub>). Attenuation constant increases by increasing the wave frequency and it shows higher values at higher T/T<sub>c</sub>. Lowest wave attenuation and the best confinement are achieved for the thickest TE waveguide. LHM-superconductor waveguide shows lower wave attenuation than LHM-metal waveguide

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Section: Introductionmentioning

confidence: 99%

“…Pure YBa 2 Cu 3 O 7−x ceramics normally display superconductivity and metallic conductivity below and above the critical temperature of the superconductor c respectively. Mohazzab, et al described the synthesis T of epoxy-modified YBCO ceramics and evaluates the semiconducting properties at temperature above c [22].…”

Section: Introductionmentioning

confidence: 99%

Attenuation in a Cylindrical Left Handed Material (LHM) Wave-Guide Structure

Mousa¹

2012

OPJ

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“…A number of articles on theory and design of three-port circulator can be found in the literature. The emphasis is on performance improvement in terms of insertion loss [15][16][17], wide band operation [20,22,28,29], temperature stabilization [29,30], isolation bandwidth [15,16,23], miniaturization [28,[30][31][32], isolation [17,24] and high power operation [19,21,26,30]. Isolation performance is critical in some radar systems.…”

Section: Introductionmentioning

confidence: 99%

A Cancellation Network for Full-Duplex Front End Circuit

Chan

Koo²,

Chung³

et al. 2009

PIER Letters

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A circulator is needed in a C-band airborne synthetic aperture radar system which employs single antenna configuration. The circulator provides full-duplex capability to transmit highpower RF signal and receive the echo signal via the same antenna simultaneously. Commercially available circulators with moderate isolation are inadequate for this application. An innovative Cancellation Network (CN) has been designed to enhance the performance of the conventional circulator. This paper highlights the conceptual design and measurement results of the CN. An improvement of more than 27 dB has been achieved.

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“…The superconducting resonator structures of interest are microstrip line resonators fabricated on dielectric MgO substrates and dielectric resonators with superconducting walls. Little effort has been devoted to ferrite-superconductor composite devices such as circulators [2] and phase shifters [3], without significant conductor losses, or to electrically tunable filters using the thermal effect [4], ferroelectrics [5], and the vortex effect under weak magnetic fields [6].…”

Section: Introductionmentioning

confidence: 99%

Microstrip superconducting resonators loaded with yttrium iron garnet single crystals

Fukusako

Tsutsumi

1998

Electron. Comm. Jpn. Pt. II

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This paper deals with an experimental study of a magnetically tunable microstrip superconducting resonator loaded with a single crystal of bulk yttrium iron garnet (YIG). Tunability of 200 MHz at a center frequency of 5.3 GHz was observed, and a quality factor of 965 was measured with minimum insertion loss of 19.5 dB for a half‐wavelength microstrip line consisting of a YIG‐YBCO‐MgO composite structure. The dispersion characteristics of the resonator were calculated using the spectral domain method. We discuss the limit of the magnetic tunability in terms of our experimental results on the mixed states of TEM and magnetostatic wave (MSW) modes. Power dependence of the characteristics is also discussed. © 1998 Scripta Technica, Electron Comm Jpn Pt 2, 81(5): 44–50, 1998

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Superconducting nonreciprocal devices for microwave systems

Cited by 19 publications

References 5 publications

Attenuation in a Cylindrical Left Handed Material (LHM) Wave-Guide Structure

Attenuation in a Cylindrical Left Handed Material (LHM) Wave-Guide Structure

A Cancellation Network for Full-Duplex Front End Circuit

Microstrip superconducting resonators loaded with yttrium iron garnet single crystals

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