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.
Bibliographical notePublisher Copyright:
© 2019 The Institute of Electronics, Information and Communication Engineers.
Copyright 2020 Elsevier B.V., All rights reserved.
- Dual-band filter
- High selectivity
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering