Vol. 111

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2010-11-27

Tunable and Switchable Bandpass Filters Using Slot-Line Resonators

By Jian-Xin Chen, Jin Shi, Zhi-Hua Bao, and Quan Xue
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
http://jpier.org/PIER/pier.php?paper=10100808

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