Narrowband high temperature superconducting filter for mobile communication systems

McErlean, E.P.; Karyamapudi, B.

doi:10.1049/ip-map:20040972

Cited by 22 publications

(9 citation statements)

References 8 publications

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“…Insertion loss is an important parameter for microwave filter performance and is inversely dependent on the filter quality factor ( Q ), bandwidth, and directly on the filter order . Insertion losses as low as 0.5 dB have been reported with a center frequency of 2 GHz. Using higher filter order, losses lower than 1 dB have also been demonstrated .…”

Section: Recent Progress In Applications Of Hts and Their Integrationmentioning

confidence: 99%

Thin‐Film‐Based Integrated High‐Transition‐Temperature Superconductor Devices

Balasubramanian

Xing

Strugo

et al. 2019

Adv Funct Materials

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Since the discovery of superconductivity at temperatures above the technologically promising liquid nitrogen temperatures, applications based on superconductors have expanded and are being put to commercial use. However, superconductivity at higher temperatures typically occurs in complex materials requiring stringent material and environmental constraints. Such restraints make the realization and integration of these materials with normal materials a nontrivial aspect. In this progress report, unique features of these superconductors in terms of their synthesis, physical properties determining interface electrical transport, and their applications are discussed. A detailed progress report on these applications with remarks on efforts taken to integrate these devices with traditional platforms and semiconducting materials is provided.

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Section: Recent Progress In Applications Of Hts and Their Integrationmentioning

confidence: 99%

Thin‐Film‐Based Integrated High‐Transition‐Temperature Superconductor Devices

Balasubramanian

Xing

Strugo

et al. 2019

Adv Funct Materials

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“…High‐temperature superconducting (HTS) filters have been playing important roles in areas of wireless communications, radar system, and radio astronomy . Most HTS filters that have been extensively studied are especially concentrated on the frequency range below S‐band .…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of the unpredictable transmission zero in X-band filter design

Jiang

Wei

Zheng

et al. 2016

Int. J. RF Microw. Comput. Aided Eng.

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This article focuses on the common problem of uncontrollable transmission zero (TZ) in X‐band filter design. Using uniform impedance rectangular resonator (UIRR) to design an X‐band filter always results in an unpredictable TZ on the low‐frequency side of the passband, which greatly deteriorates the frequency selectivity of the filter performance. Electromagnetic coupling polarity analysis of the UIRR shows that the magnetic crosscoupling between nonadjacent resonators which is opposite to the main coupling plays a major role in the unpredictable TZ. By optimizing the UIRR from the loop structure with a small opening to the folded one, weak couplings between resonators are obtained. A high‐temperature superconducting filter at X‐band using folded UIRR resonator was designed and fabricated with a center frequency of 10.01 GHz and a bandwidth of 58 MHz, and the uncontrollable TZ has been removed successfully from the low‐frequency side of passband. The measured insertion loss is less than 0.4 dB and the return loss is greater than 15 dB.

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“…Thus, multiple‐pole HTS filters can be designed and fabricated to achieve excellent performance with low insertion loss, steep band edges, and high out‐of‐band rejection. HTS filters can be used for wireless communication, astronomical observation, and microwave detection, among other applications . HTS filters and high Q X‐band resonators have recently attracted increasing attention .…”

Section: Introductionmentioning

confidence: 99%

High‐performance narrowband superconducting filters with high Q resonators at X‐band

Song

Wei

Cao

et al. 2014

Micro & Optical Tech Letters

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This paper presents two narrowband high‐temperature superconducting (HTS) filters at 10 GHz with a 0.6% fractional bandwidth. Uniform impedance rectangular resonator (UIRR) and stepped impedance H‐type resonator (SIHR) are proposed to achieve HTS filters with high Q value, low sensitivity, weak coupling, and good parasitic response. A six‐pole HTS filter that has UIRRs with a Q value of 17,700 is fabricated; this filter has a 19.9 dB return loss and a 0.38 dB insertion loss. An eight‐pole HTS filter that has SIHRs with a Q value of 12,100 is also manufactured; this filter has a 12.2 dB return loss and a 0.64 dB insertion loss. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1516–1520, 2014

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Narrowband high temperature superconducting filter for mobile communication systems

Cited by 22 publications

References 8 publications

Thin‐Film‐Based Integrated High‐Transition‐Temperature Superconductor Devices

Thin‐Film‐Based Integrated High‐Transition‐Temperature Superconductor Devices

Analysis and optimization of the unpredictable transmission zero in X-band filter design

High‐performance narrowband superconducting filters with high Q resonators at X‐band

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