Varactor-tuned hairpin bandpass filter with an attenuation pole

Author

Chung, Moon-Seok ; Kim, Il-Soo ; Yun, Sang-Won

Author_Institution

Dept. of Electr. Eng., Sogang Univ., Seoul, South Korea

Volume

4

fYear

2005

fDate

4-7 Dec. 2005

Abstract

In this paper, a varactor-tuned hairpin bandpass filter using a tapped open stub is studied. In this configuration the filter´s center frequency as well as the bandwidth can be controlled. The tapped open stub introduces the attenuation pole which can be located near the passband by adjusting the stub length. Varactors loaded at the end of hairpin resonator and the tapped open stub enable us to control the center frequency with constant bandwidth as well as to have a large tuning bandwidth. Based on the detailed analysis, the varactor-tuned hairpin bandpass filter is designed, in which the tuning bandwidth reaches 15 % of the center frequency at 2 GHz.

Keywords

UHF filters; band-pass filters; microstrip filters; resonators; varactors; 2 GHz; attenuation pole; center frequency control; hairpin bandpass filter; hairpin resonator; microstrip filters; stub length; tapped open stub; tunable filters; tuning bandwidth; varactors; Active filters; Attenuation; Band pass filters; Bandwidth; Frequency; Microstrip filters; Resonator filters; Tunable circuits and devices; Tuning; Varactors; Bandpass filters; microstrip filters; tunable filters; varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings

Print_ISBN

0-7803-9433-X

Type

conf

DOI

10.1109/APMC.2005.1606748

Filename

1606748