NDLI: Four-Pole Narrowband Superconducting Tunable Filter at VHF-Band

Content Provider	IEEE Xplore Digital Library
Author	Guannan Suo Xubo Guo Bisong Cao Bin Wei Xiaoping Zhang Zhaojiang Shang Guoyong Zhang
Copyright Year	2002
Abstract	This paper presents a narrowband superconducting tunable filter at very high frequency (VHF)-band with a fractional bandwidth of 1.4%. The effect of the resonator structure on the unloaded quality factor and frequency tuning range is analyzed and simulated. A shorted spiral resonator, with the inner end loaded with a gallium arsenide (GaAs) varactor through air bridges, is chosen for compact size, wide tuning range, and high quality factor. The interstage and external couplings of this resonator remain almost unchanged with the varactor capacitance. Thus, the filter keeps a constant fractional bandwidth in the entire tuning range. The four-pole tunable filter at VHF-band is successfully designed with a compact size of 30 mm × 14.6 mm. The measured results match well with the simulated results. The tuning range of the filter is 17%, from 193.9 to 229.8 MHz. The variation of the fractional bandwidth is within (1.40 ± 0.01)%. The insertion loss at 229.8 MHz is 0.32 dB, with a reverse bias voltage of 9 V. The unloaded quality factor of the resonators in the four-pole filter is estimated to be 5600 at 229.8 MHz.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1
Ending Page	5
Page Count	5
File Size	791197
File Format	PDF
ISSN	10518223
Volume Number	24
Issue Number	6
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	Resonator filters Superconducting filters Microwave filters Varactors High-temperature superconductors Tuning Band-pass filters varactor Bandpass filter constant fractional bandwidth (CFBW) superconducting tunable
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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