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Compact Broad Band-pass Filter of Parallel Coupled Structure with SIR
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 Title & Authors
Compact Broad Band-pass Filter of Parallel Coupled Structure with SIR
Lee, Jeong-Hun; Hong, Tae-Ui; Yoon, Ki-Cheol;
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In this paper, the reduced size of broad bandpass filter with parallel coupled line structure is presented. This proposed filter can control bandwidth of narrow to broadband by adjusting the coupling coefficient. The conventional filter is operated with a narrow band. If a higher bandwidth is desired than the conventional narrow bandwidth, it is hard to realize due to the coupling coefficient between feeding line and resonator. In this paper, to overcome this limitation, a proposed bandpass filter is designed with reduced size due to SIR (Stepped Impedance Resonator), U-shaped open stub with hair-pin and vertical-type structure than conventional one, and it has characteristics of adjusting bandwidth freely as per quantity of coupling coefficient. The proposed bandpass filter that, experimental results of insertion and return losses are 0.42 dB and 24.5 dB with bandwidth of 60 % at the center frequency of 5.8 GHz, respectively.
SIR;broad band;coupling coefficient;compact size;ABCD matrix;
 Cited by
임피던스 부정합 및 SIR을 적용한 개방형 광대역 소형 스터브 대역통과 여파기,이원석;윤기철;

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