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A coplanar waveguide bandwidth-tunable lowpass filter with broadband rejection

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4 Author(s)
Chia-Cheng Huang ; Dept. of Commun. Eng., Yuan Ze Univ., Jhongli, Taiwan ; Nan-Wei Chen ; Hsuan-Ju Tsai ; Jyun-Yu Chen

A coplanar waveguide lowpass filter (CPW-LPF) with high bandwidth tunability and broadband rejection is demonstrated. Compared to the reported design approaches, a relatively straightforward design with varactor-tuned microwave resonators is proposed for the realization of the tunable CPW-LPF. It is shown that the presented tunable CPW-LPF has a wide bandwidth tuning range via a small bias swing, low passband insertion loss, as well as wideband rejection. Also, the filter roll-off remains unchanged while the cut-off frequency is varied. The proposed tunable CPW-LPF is experimentally verified and expected to find applications in modern communication systems.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:23 ,  Issue: 3 )