This paper presents a compact tunable tri-band filter with independently controlled passbands and high selectivity. The filter is comprised of three pairs of varactor-loaded λ/4 short-circuited resonators. Each passband of the filter can be independently tuned by varying the voltage applied to the corresponding resonators. In addition, a source-load coupling structure is employed to produce transmission zeros (TZs) achieving high selectivity. A prototype tunable tri-band microstrip filter is implemented. The experiment results show that the three passbands have tuning ranges of 0.81-0.99 GHz, 1.34-1.54 GHz, and 1.8-2.03 GHz, respectively.
|Number of pages||3|
|Journal||IEICE Electronics Express|
|Publication status||Accepted/In press - 17 Oct 2019|
Bibliographical notePublisher Copyright:
Copyright © 2019 The Institute of Electronics, Information and Communication Engineers
Copyright 2020 Elsevier B.V., All rights reserved.
- Microstrip filter
- Tri-band filter
- Tunable filter
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering