NDLI: Low Loss Tunable Superconducting Dual-Mode Filter at L-Band Using Semiconductor Varactors

Content Provider	IEEE Xplore Digital Library
Author	Guannan Suo Xubo Guo Bisong Cao Bin Wei Xiaoping Zhang Zhaojiang Shang Guoyong Zhang
Copyright Year	2001
Abstract	This letter presents a superconducting continuously tunable bandpass filter with dual-mode resonator and Gallium arsenide (GaAs) varactors. The even- and odd-modes of the dual-mode resonator can be tuned simultaneously using a single bias voltage. The interstage and external couplings are realized with interdigital coupling structure to enhance the coupling strength. A four-pole dual-mode superconducting filter at L-band with a fractional bandwidth of approximately 20% is successfully designed. Two transmission zeros are generated in the upper stopband to increase the stopband rejection. The tuning range of the filter is 16% from 784.92 to 918.23 MHz. The insertion loss at 918.23 MHz is 0.69 dB with a reverse bias voltage of 9 V. The measurements of the filter match well with the simulated ones.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	170
Ending Page	172
Page Count	3
File Size	680451
File Format	PDF
ISSN	15311309
Volume Number	24
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Varactors High-temperature superconductors Couplings Tuning Superconducting filters Microwave filters varactor Bandpass filter (BPF) dual-mode resonator high-temperature superconducting (HTS) tunable
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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