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PIER PIER B PIER C PIER M PIER Letters
2012-12-21
A Tunable 1.4-2.5 GHz Bandpass Filter Based on Single Mode
By
YanYi Wang,

    Dr. YanYi Wang

    Xidian University

    China

    Homepage

Feng Wei,

    Prof. Feng Wei

    Xidian University

    China

    Homepage

He Xu,

    Dr. He Xu

    Xidian University

    China

    Homepage

Xiao-Wei Shi

    Professor Xiao-Wei Shi

    School of Electronics Engineering

    Xidian University

    China

    Homepage

Progress In Electromagnetics Research, Vol. 135, 261-269, 2013
doi:10.2528/PIER12111704
Abstract
A new type of varactor-tuned microstrip bandpass filter (BPF) based on a single 1/2λ resonator is investigated. The proposed resonator is composed of a transmission line with both ends short-ended and two varactors inserted symmetrically in the middle section. The variation of coupling coefficient can be controlled by using an inductor. With the proposed structure, it is easy to adjust the external quality factor of the filter and to control the bandwidth. Extra dc-block capacitors for the input and output ports are not necessary because the design of the proposed tunable 1/2λ resonator makes the varactor act as both a frequency tuning element and a dc-block circuit. The proposed BPF is found to have the advantages of compact size, low insertion loss, large tuning range and good linearity.
Citation
YanYi Wang, Feng Wei, He Xu, and Xiao-Wei Shi, "A Tunable 1.4-2.5 GHz Bandpass Filter Based on Single Mode," Progress In Electromagnetics Research, Vol. 135, 261-269, 2013.
doi:10.2528/PIER12111704
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