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http://dx.doi.org/10.5515/KJKIEES.2011.22.9.852

A Tuable Dual-Band Bandpass Filter Design Using Variable Characteristic Transmission Lines  

Chaudhary, Girdhari (Department of Electronics & Communication Engineering, IT Convergence Research Center, Chonbuk National University)
Jeong, Yong-Chae (Department of Electronics & Communication Engineering, IT Convergence Research Center, Chonbuk National University)
Lim, Jong-Sik (Department of Electronics & Communication Engineering, Soonchunhyang University)
Kim, Dong-Su (Korea Electronics Technology Institute)
Kim, Jun-Chul (Korea Electronics Technology Institute)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.22, no.9, 2011 , pp. 852-857 More about this Journal
Abstract
In this paper, 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 frequency passband and a controllable second passband. The tuning of the second passband is achieved by varying the characteristic impedance of and open shunt stub line in a stub loaded resonator(SLR) with the help of a defected ground structure(DGS) transmission line and varactor diodes. In order to validate the proposed structure, a two stage dual-band BPF with three transmission zeros was implemeted and experimentally verified based on its theoretical predictions and simulations.
Keywords
Bandpass Filter; Stub Loaded Resonator; Defected Ground Structure; Dual-Band Filter; Varactor Diode;
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