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A folded coupled-line structure and its application to filter and diplexer design

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4 Author(s)
Chih-Ming Tsai ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Sheng-Yuan Lee ; Chia-Cheng Chuang ; Chin-Chuan Tsai

In this paper, a folded coupled-line structure which can create a transmission zero is studied. A rough estimate for the frequency of this transmission zero is also given. A compact second-order filter with the folded coupled-line structures and a skew-symmetric (zero-degree) feed structure is designed. The improved shape factor and out-of-band response of this new filter are compared with those of a conventional second-order filter. Finally, this new filter topology is applied to the design of a diplexer.

Published in:

Microwave Symposium Digest, 2002 IEEE MTT-S International  (Volume:3 )

Date of Conference:

2-7 June 2002