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Progress In Electromagnetics Research
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A HIGH BAND ISOLATION AND WIDE STOPBAND DIPLEXER USING DUAL-MODE STEPPED-IMPEDANCE RESONATORS

By C.-Y. Huang, M.-H. Weng, C.-S. Ye, and Y.-X. Xu

Full Article PDF (593 KB)

Abstract:
In this paper, a high performance diplexer is designed and fabricated for Global Positioning System (GPS) and wireless local area network (WLAN) applications simultaneously. The diplexer mainly comprises two dual-mode ring bandpass filters (BPFs), operated at 1.575 GHz and 2.4 GHz, respectively. By using the stepped-impedance resonator (SIR) in the BPFs, the size reduction and wide stopband from 2.8 GHz to 6 GHz are obtained. Moreover, several transmission zeros are located at the passband edges, thus improving the passband selectivity. Due to impedance matching between two BPFs, a high isolation greater than 40 dB between two channels is obtained. The diplexer is investigated numerically and experimentally. The simulated and measured results have a good agreement with the proposed design concept.

Citation:
C.-Y. Huang, M.-H. Weng, C.-S. Ye, and Y.-X. Xu, " a high band isolation and wide stopband diplexer using dual - mode stepped - impedance resonators ," Progress In Electromagnetics Research, Vol. 100, 299-308, 2010.
doi:10.2528/PIER09112701
http://www.jpier.org/PIER/pier.php?paper=09112701

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