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A tunable bandstop filter design using parallel coupled line resonator with varactor

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4 Author(s)
Sang-Yun Lee ; School of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea ; Won-Gyu Lim ; Won-Seok Jeong ; Jong Won Yu

In this paper, a novel tunable bandstop filter has been proposed and fabricated. This filter is compact because the resonator is located under the microstrip line not to occupy much space. The equivalent circuit model of the proposed structure is proposed. By employing a varactor diode which has variable capacitance, the tunable bandstop characteristic is achieved. The fabricated bandstop filter shows good tunability( 1.04-3.13 GHz).

Published in:

2008 Asia-Pacific Microwave Conference

Date of Conference:

16-20 Dec. 2008