Design of Dual-Band Bandpass Filter Using DGS With Controllable Second Passband

Author

Chaudhary, Girdhari ; Choi, Heungjae ; Jeong, Yongchae ; Lim, Jongsik ; Kim, Dongsu ; Kim, Jun-Chul

Author_Institution

Dept. of Electron. & Inf. Eng., Chonbuk Nat. Univ., Jeonju, South Korea

Volume

21

Issue

11

fYear

2011

Firstpage

589

Lastpage

591

Abstract

In this letter, the application of a variable characteristic impedance transmission line that can be used to design a dual-band bandpass filter (BPF) is presented. The proposed filter offers a fixed first passband and a controllable second passband. The tuning of the second passband is achieved by varying the characteristic impedance of the shunt open stub of stub loaded resonator (SLR) with the help of a defected ground structure (DGS) transmission line and varactor diodes. In order to validate the theoretical predictions and simulated results, a two stage dual-band BPF with three transmission zeros was implemented and experimentally verified.

Keywords

band-pass filters; defected ground structures; diodes; resonators; varactors; DGS transmission line; SLR; controllable second passband; defected ground structure; dual-band BPF; dual-band bandpass filter; fixed first passband; stub loaded resonator; varactor diode; variable characteristic impedance transmission line; Band pass filters; Dual band; Impedance; Passband; Power transmission lines; Resonant frequency; Varactors; Bandpass filter (BPF); defected ground structure; dual-band filter; stub loaded resonator;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2011.2167140

Filename

6035998