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Bandpass Filter Using Dual-mode Resonator with Radial Stub  

Yun, Tae-Soon (호남대학교 이동통신공학과)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.10, no.3, 2011 , pp. 74-78 More about this Journal
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 $6.9{\Omega}$ i.e. realized by parallel two radial stubs with $60^{\circ}$ 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.
Keywords
Dual-mode resoantor; bandpass filter; radial-stub; inverter; transmission zero;
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