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The Journal of The Korea Institute of Intelligent Transport Systems Vol.10 No.3 pp.74-78
래디얼 스터브를 통해 구현된 이중 모드 공진기를 이용한 대역 통과 필터
Bandpass Filter Using Dual-mode Resonator with Radial Stub
Abstract
In this paper, the bandpass filter for ITS system of 5.8 GHz is proposed by using the dual-mode resonator with the radial stub. As alternating the open stub with the radial stub, the size of the dual mode resonator can be reduced about 39.6% and the out-of-band characteristics of the bandpass filter using dual mode resonator can be enhanced from 19.4 dB to 29.1 dB by using the stub of 6.9Ω i.e. realized by parallel two radial stubs with 60° angle. The fabricated bnadpass filter using the dual mode resonator has the center frequency of 5.72 GHz with the fractional bandwidth of 4.1%. Also, the filter has the insertion loss and return loss of 1.79 dB and 19.4 dB, respectively.
