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The Journal of The Korea Institute of Intelligent Transport Systems Vol.7 No.6 pp.38-47
전송선로의 임피던스 부정합을 이용한 협대역 개방형 소형 스터브 대역통과 여파기
Compact Open-stub Band-pass Filter with Narrow Bandwidth Using impedance Mismatching of the Transmission-line
Abstract
In this paper, the narrow band-pass filter with compact-size using the ag/2 open stubs is proposed. The filter size is reduced by realization of transmission line at second harmonics and at the same time the power can be transferred to the output by using the fundamental wave generated in the resonator and the transmission line in which the impedance mismatch technique is adopted. Thus, the proposed filter can be reduced to half-length of horizontal transmission line than the conventional one. The experimental results show that insertion loss is 1.58 dB and return loss is 9.86 dB, and the fractional bandwidth is 10 % at the center frequency of 5.8 GHz. The filter size is 10.34*18.56 mm2.
