Compact tunable dual-band bandpass filter with independently tunable passbands and high selectivity

Research output: Contribution to journalArticlepeer-review


  • Fan Zhang
  • Yang Yu
  • Yang Gao
  • Yi Zhang
  • Yun Xiao Peng
  • Cheng Guo
  • Jun Xu

Colleges, School and Institutes

External organisations

  • University of Electronic Science and Technology of China
  • Zhengzhou University
  • Chiba University


This paper presents a compact varactor-tuned dual-band bandpass filter with independently tunable passbands and high selectivity. The filter consists of two varactor-loaded half-wavelength dual mode resonators, each of which features independent tunability of odd-and even-mode resonant frequencies by varying the capacitances of the corresponding loading varactor diodes. Benefiting from this feature, the filter offers two independently controllable passbands. In addition, hook-shape feed lines are utilized to create transmission zeros between the two passbands, which enhances the selectivity of the filter.

Bibliographic note

Publisher Copyright: © 2019 The Institute of Electronics, Information and Communication Engineers. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.


Original languageEnglish
Article number20190237
JournalIEICE Electronics Express
Issue number11
Publication statusPublished - 2019


  • Compact, Dual-band filter, High selectivity, Tunable