Compact Tunable Microstrip Bandpass Filters with Asymmetrical Frequency Response

Author

Tang, Wenxing ; Hong, Jia-Sheng ; Chun, Young-Hoon

Author_Institution

Dept. of Electr., Heriot-Watt Univ., Edinburgh

fYear

2008

fDate

27-31 Oct. 2008

Firstpage

599

Lastpage

602

Abstract

A new type of electronically tunable asymmetric frequency response bandpass filter based on dual-mode open-loop resonator is investigated. By employing the unique characteristic of the dual-mode open-loop resonator, that is, whose two operating modes (odd-and even-modes) do not couple to each other, tuning the passband frequency becomes simple with single DC bias circuit. Two designed tunable bandpass filters of this type are demonstrated experimentally, which show more than 10 dB of return loss and less than 3 dB insertion loss over a tuning range of 12% from 0.83 to 0.93 GHz.

Keywords

UHF filters; band-pass filters; cavity resonator filters; frequency response; microstrip filters; asymmetrical frequency response; compact tunable microstrip bandpass filters; dual-mode open-loop resonator; frequency 0.83 GHz to 0.93 GHz; insertion loss; loss 10 dB; passband frequency tuning; return loss; Band pass filters; Capacitance; Circuit optimization; Frequency response; Microstrip filters; Microstrip resonators; Passband; Resonator filters; Tunable circuits and devices; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2008. EuMC 2008. 38th European

Conference_Location

Amsterdam

Print_ISBN

978-2-87487-006-4

Type

conf

DOI

10.1109/EUMC.2008.4751523

Filename

4751523