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Reconfigurable Bandpass Filter With Separately Relocatable Passband Edge

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3 Author(s)
Hsuan-Ju Tsai ; Department of Electrical Engineering and the Graduate Institute of Communication Engineering, National Taiwan University, Taipei, Taiwan ; Nan-Wei Chen ; Shyh-Kang Jeng

A reconfigurable bandpass filter (BPF) with separately relocatable passband edges is demonstrated. The proposed design approach exploits simple stub-based structures and varactor-tuned microwave resonators for the BPF realization. The filter bandwidth reconfigurability is obtained via a separate relocation of each passband edge, and the harmonics inherited in the varactor-tuned microwave resonators are easily suppressed with the stub-based structures. The fabricated filter has a low passband insertion loss (<; 2.0 dB), a 21.8% higher band edge tuning range, a 18.2% lower band edge tuning range, as well as wideband suppression (>; 15 dB at the frequencies up to 5.5 GHz).

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:22 ,  Issue: 11 )