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Duplexer application for a band-pass filter with open stub using parallel coupled-line

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9 Author(s)
Tae-Sung Jung ; Dept. of Wireless Commun. Eng., Kwangwoon Univ., Seoul, South Korea ; Ki-Cheol Yoon ; Dong-Ki Lee ; Hee Nam
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In this paper, a duplexer using the open stub band-pass filter(BPF) with parallel coupled line is presented. The suggested duplexer is composed of distributed elements and planar substrate and it has characteristic of excellent isolation. The operating frequencies of the duplexer are respectively 5.8 GHz and 4.8 GHz at the RX and TX for C-band wireless communication systems. Also, the deviation frequency is 40 MHz and the bandwidth of filter is 10 %. The experimental results for insertion losses of filters are less than 2 dB at RX and TX, while the return losses are better than 15 dB.

Published in:

Intelligent Radio for Future Personal Terminals (IMWS-IRFPT), 2011 IEEE MTT-S International Microwave Workshop Series on

Date of Conference:

24-25 Aug. 2011