NDLI: Substrate-integrated coaxial-cavity filter with tunable center frequency and reconfigurable bandwidth

Content Provider	IEEE Xplore Digital Library
Author	Anand, A. Xiaoguang Liu
Copyright Year	2014
Description	Author affiliation: Univ. of California, Davis, Davis, CA, USA (Anand, A.; Xiaoguang Liu)
Abstract	This paper presents a substrate-integrated coaxial-cavity bandpass filter with both continuous center frequency tuning and continuous bandwidth (BW) tuning. A surface mount varactor connects the center conductors of the coaxial resonators. Tuning this varactor's capacitance changes the inter-resonator coupling between the resonators and tunes the BW. Another surface mount varactor on the coplanar waveguide feed line adjusts the external coupling at different BWs. Lumped varactors are also used to capacitively load the coaxial transmission line to tune the center frequency. Measured results show a BW range of 20-100 MHz from 0.8 GHz to 1.13 GHz and a BW range of 34-40 MHz from 0.55 GHz to 1.13 GHz with return loss better than 10 dB. Peak insertion loss of 1.07 dB is measured at 1.13 GHz with 100 MHz BW. Due to dispersive inter-resonator coupling, a transmission zero occurs above the passband that sharpens skirt selectivity. Fabrication is compatible with standard PCB technology with single-layer surface-mount lumped elements as tuners.
Starting Page	1
Ending Page	4
File Size	545144
Page Count	4
File Format	PDF
ISBN	9781479946082
DOI	10.1109/WAMICON.2014.6857772
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Couplings Tuning Varactors Microwave filters Substrates Cavity resonators Coplanar waveguides waveguide filters combline filter combline resonator evanescent-mode design tunable bandwidth tunable filters tunable res-onators
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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