Tunable bandpass filter using varactor-loaded quarter-wavelength resonator

Author

Cheng, Fei ; Lin, Xianqi ; Hu, Yiyao ; Fan, Yong

Author_Institution

Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

5

fYear

2012

fDate

5-8 May 2012

Firstpage

1

Lastpage

3

Abstract

In this work, a tunable bandpass filter using quarter-wavelength resonator is studied. The resonant frequency of each resonator can be tuned by the mid-loaded varactors. The two resonators are connected by a metalized via which behaves as a lumped inductor. The via also provides DC bias for the varactors. In addition, source-load coupling is introduced to create two transmission zeros on each side of the passband to enhance stopband rejection performance. The proposed tunable filter exhibits wide tuning range with low loss and good stopband rejection.

Keywords

band-pass filters; band-stop filters; inductors; resonator filters; varactors; lumped inductor; mid-loaded varactors; quarter-wavelength resonator; resonant frequency; source-load coupling; stopband rejection; transmission zeros; tunable bandpass filter; varactor-loaded resonator; Band pass filters; Capacitance; Couplings; Filtering theory; Microstrip filters; Resonant frequency; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on

Conference_Location

Shenzhen

Print_ISBN

978-1-4673-2184-6

Type

conf

DOI

10.1109/ICMMT.2012.6230374

Filename

6230374