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PIER PIER B PIER C PIER M PIER Letters
2010-11-27
Tunable and Switchable Bandpass Filters Using Slot-Line Resonators
By
Jian-Xin Chen,

    Prof. Jian-Xin Chen

    School of Electronics and Information

    Nantong University

    China

    Homepage

Jin Shi,

    Dr. Jin Shi

    Department of Electronic Engineering

    City University of Hong Kong

    Hong Kong, China

    Homepage

Zhi-Hua Bao,

    Dr. Zhi-Hua Bao

    School of Electronics and Information

    Nantong University

    China

    Homepage

Quan Xue

    Dr. Quan Xue

    Department of Electronic Engineering

    City University of Hong Kong

    China

    Homepage

Progress In Electromagnetics Research, Vol. 111, 25-41, 2011
doi:10.2528/PIER10100808
Abstract
In this paper, novel uniplanar tunable and switchable bandpass filters are designed by using the centrally-loaded slot-line resonator. From the voltage-wave distribution along the resonator, the appropriate location for the loading element is determined to be the center of the slot-line resonator, where the voltages of the fundamental signal and second harmonic are maximum and zero, respectively. As a result, the fundamental frequency can be tuned while the second harmonic remains almost unchanged. For the first time, the properties of the centrally-loaded slot-line resonator are analyzed by using the even- and odd-mode method, and their respective resonant frequencies are derived. The demonstrated tunable bandpass filter can give a 30.9% frequency tuning range with acceptable insertion loss when a varactor is used as the loading element. By replacing the loading varactors with PIN diodes, a switchable bandpass filter is realized in which the attenuation in the fundamental passband can be controlled. In experiments, the switchable bandpass filter exhibits a 2.13 dB insertion loss in the fundamental passband when the PIN diodes are off and more than 49 dB isolation across the passband when the PIN diodes are on.
Citation
Jian-Xin Chen, Jin Shi, Zhi-Hua Bao, and Quan Xue, "Tunable and Switchable Bandpass Filters Using Slot-Line Resonators," Progress In Electromagnetics Research, Vol. 111, 25-41, 2011.
doi:10.2528/PIER10100808
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