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Fabrication and Design of a Compact Narrow Band Pass Filter Using Slot Type Split Spiral Resonators  

Choi, Dong-Muk (Kyungpook National University)
Kim, Dang-Oh (Kyungpook National University)
Jo, Nam-I (Kyungpook National University)
Kim, Che-Young (Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.47, no.4, 2010 , pp. 38-42 More about this Journal
Abstract
In this paper, a design method of the compact narrow band filter on the microstrip board is proposed using slot-type split spiral resonators. The design technique of this filter is based on cascading filter stages consisting of the combination of slot-type split spiral resonators, 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 loss shows good results about -3.47dB at the center frequency($f_0$=1GHz) and passband return loss is less than -12.62dB. The 3dB fractional bandwidth(FBW) is approximately 7.3%. The results of the frequency response measured on the fabricated band pass filter substrate show satisfactory agreement with the simulated frequency responses by the MWS(Microwave Studio) of CST in the region of interest.
Keywords
Slot Type Split Spiral Resonators; Meta-Materials; Microstrip lines; Microwave Filter;
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