Vol. 5

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2008-10-29

Improved Compact Broadband Bandpass Filter Using Branch Stubs Co-via Structure with Wide Stopband Characteristic

By Wen-Jeng Lin, Chin-Sheng Chang, Jian-Yi Li, Ding-Bing Lin, Lih-Shan Chen, and Mau-Phon Houng
Progress In Electromagnetics Research C, Vol. 5, 45-55, 2008

Abstract

In this paper, a broadband bandpass filter (BPF) with superior spurious suppression over a wide frequency range at least up to 20 GHz at −20 dB has been designed. The proposed broadband bandpass filter has designed using quarter-wavelength short stubs alternating with branch stubs co-via structure, and inserting the bandstop filters to substitute for redundant connecting lines. Compare with some traditional co-via structure, this work by using the branch stubs to construct the co-via structure, not only reduce the size around 70% but also decrease the radiation loss due to some complex meander configurations occurring in the connecting lines. For the prototype broadband filter, center frequencies around 4 GHz were selected. The bandwidth of passband was between 1.95 GHz and 6.25 GHz, in which the insertion-loss amounts to around −1.5 dB. The suppression range of stopbandis between 8.2-20.3 GHz, in which the insertion-loss amounts to around −20 dB.

Citation


Wen-Jeng Lin, Chin-Sheng Chang, Jian-Yi Li, Ding-Bing Lin, Lih-Shan Chen, and Mau-Phon Houng, "Improved Compact Broadband Bandpass Filter Using Branch Stubs Co-via Structure with Wide Stopband Characteristic," Progress In Electromagnetics Research C, Vol. 5, 45-55, 2008.
http://jpier.org/PIERC/pier.php?paper=08092602

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