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Open AccessArticle

High-Performance Compact Multi-Mode UWB Filter using High-Temperature Superconductivity

1
The School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, China
2
Department of Mechanical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(12), 1473; https://doi.org/10.3390/electronics8121473
Received: 4 November 2019 / Revised: 27 November 2019 / Accepted: 30 November 2019 / Published: 4 December 2019
(This article belongs to the Special Issue RF/Microwave Antenna, Circuit, and System Design for UAV Applications)
A high-performance miniaturized multi-mode ultra-wide band (UWB) filter is proposed in this paper. The simple compact quintuple-mode resonator is constructed by loading three sets of open stubs on a modified conventional triple-mode resonator. Even and odd mode analytical methods are applied to analyze it. In addition, the function of each part of the filter is studied in cases of weak/strong coupling. In order to further improve the insertion loss, selectivity and out-of-band suppression, the designed filter is finally fabricated on double-sided YBCO/MgO/YBCO high-temperature superconducting (HTS) film. The test results show that the HTS UWB filter has excellent performance, and the simulation results are in good agreement with the test ones. The 3-dB bandwidth covers 3.6 ~ 13.2 GHz. The maximum insertion loss in the band was only 0.32 dB, and the reflection was better than –15.1 dB. The band-edge roll-off rate was 56 dB/GHz and the upper stopband with 20 dB rejection extended to 20.7 GHz. View Full-Text
Keywords: ultra-wide band (UWB); filter; multi-mode resonator; high-temperature superconductivity (HTS); stub-loaded ultra-wide band (UWB); filter; multi-mode resonator; high-temperature superconductivity (HTS); stub-loaded
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MDPI and ACS Style

Zhou, L.; Long, Z.; Wu, H.; Li, H.; Zhang, T. High-Performance Compact Multi-Mode UWB Filter using High-Temperature Superconductivity. Electronics 2019, 8, 1473.

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