DocumentCode :
1453037
Title :
Corrugated Microstrip Coupled Lines for Constant Absolute Bandwidth Tunable Filters
Author :
El-Tanani, Mohammed A. ; Rebeiz, Gabriel M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California at San Diego, La Jolla, CA, USA
Volume :
58
Issue :
4
fYear :
2010
fDate :
4/1/2010 12:00:00 AM
Firstpage :
956
Lastpage :
963
Abstract :
This paper presents corrugated coupled lines for miniaturized fixed and tunable microstrip bandpass filters. The novel approach uses microstrip corrugated coupled-line concept to synthesize a coupling coefficient, which maintains a nearly constant absolute bandwidth across the tuning range. A miniaturized two-pole varactor tuned filter is demonstrated with a frequency coverage of 1.32-1.89 GHz and an insertion loss < 3 dB with a constant 1-dB bandwidth of 70 ?? 4 MHz across the tuning range. In addition, a three-pole comb-line 4.7% fixed filter at 1.94 GHz shows a 3:1 resonator spacing reduction over the conventional approach with an insertion loss of only 1.1 dB. This technique will allow the design of miniaturized small bandwidth fixed and tunable microstrip filters.
Keywords :
band-pass filters; microstrip filters; varactors; constant absolute bandwidth tunable filters; corrugated microstrip coupled lines; fixed filters; frequency 1.32 GHz to 1.89 GHz; insertion loss; microstrip bandpass filters; miniaturized small bandwidth; miniaturized two-pole varactor tuned filter; tunable microstrip filters; Comb-line filter; constant bandwidth tunable filter; miniature planar filter; tunable filter; varactor diodes;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2010.2042517
Filename :
5438828
Link To Document :
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