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Loss compensated high-Q tunable basspass filter using microstrip ring resonators

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3 Author(s)
Jia Chen ; Sch. of Inf. Sci. & Eng., Southeast Univ., Nanjing, China ; Luong Ngoc Quyen ; Xiaowei Zhu

A loss compensated tunable bandpass filter based on varactor-tuned microstrip square ring resonators is presented, which has a tuning range of 698-802MHz and steep skirt frequency response. The filter employs a PHEMT ATF34143 with appropriate feedback elements acting as a negative resistance circuit which not only reduces the insertion loss but also increases Q-factor significantly. According to the simulation results, the filter has a 3-dB fractional bandwidth of 1% and an insertion loss of about 6.8dB.

Published in:

Advanced Technologies for Communications (ATC), 2011 International Conference on

Date of Conference:

2-4 Aug. 2011