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Design of a Compact Narrow Band Pass Filter Using the Circular CSRR  

Choi, Dong-Muk (경북대학교 전자전기컴퓨터학부)
Kim, Dang-Oh (경북대학교 전자전기컴퓨터학부)
Kim, Che-Young (경북대학교 전자전기컴퓨터학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.11A, 2009 , pp. 918-923 More about this Journal
Abstract
In this paper, a design method of the compact narrow band filter on the microstrip board is proposed using complementary split-ring resonators(CSRRs). The design technique of this filter is based on cascading filter stages consisting of the combination of circular CSRRs, capacitive gaps between patches, and inductive grounded stubs with the meander configuration. By these means, it was possible to get the nearly symmetric frequency responses, adjustable bandwidths, compact sizes. And also excellent characteristic of the out-of-band rejection is achieved in contrast to the conventional filter design technique. The measured insertion shows good results about -4.0dB at the center frequency($f_0=1GHz$) and passband return loss is less than -9.4dB. The 3dB fractional bandwidth(FBW) is approximately 4%. The results of the frequency response measured on the fabricated band pass filter substrate show satisfactory agreement with the simulated frequency responses by the HFSS in the region of interest.
Keywords
Complementary Split Ring Resonators; Microstrip lines; Microwave Filter;
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