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A 1–1.5 GHz broadband tunable bandpass filter

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3 Author(s)
Yi-Ming Chen ; Department of Electrical Engineering, National Chung Cheng University 168, University Rd., Chia-Yi, Taiwan ; Sheng-Fuh Chang ; Tai-Chuan Chao

This paper presents a broadband tunable bandpass filter based on varactor-loaded meandered combline topology. A new coupling path is introduced between the input and output multi-section stepped-impedance coupled lines such that the transmission zeros near the passband can be simultaneously controlled to achieve the desired stopband rejection. The measured performances show that a broad 40% tuning range from 1 GHz to 1.5 GHz was achieved. Across the whole tuning range, the insertion loss is 2.1-2.8 dB and the return loss is better than 15 dB and stopband rejection greater than 32 dB.

Published in:

2012 Asia Pacific Microwave Conference Proceedings

Date of Conference:

4-7 Dec. 2012