Vol. 80

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2018-12-17

High Selective and Wide-Stopband Bandpass Filter Using Simple Uniform Impedance Resonators

By Kai-Ran Xiang and Fu-Chang Chen
Progress In Electromagnetics Research Letters, Vol. 80, 135-141, 2018
doi:10.2528/PIERL18102601

Abstract

A fifth-order bandpass filter with high selectivity and wide-stopband by using quarter- and half-wavelength uniform impedance resonators (UIRs) is presented in this letter. The use of a terminated coupled line provides controllable transmission zeros that can suppress the parasitic passbands. A pair of transmission zeros is generated on both sides of the passband by introducing cross-coupling. As a result, high selectivity and wide stopband can be achieved simultaneously. The method of controlling transmission zeros using a coupled line and an open/short-circuited stub is analyzed, and the method of improving passband selectivity using cross-coupling is given in detais. The concept is experimentally tested in a microstrip bandpass filter with center frequency 1 GHz. The measured attenuation is better than 24 dB up to 18 GHz.

Citation


Kai-Ran Xiang and Fu-Chang Chen, "High Selective and Wide-Stopband Bandpass Filter Using Simple Uniform Impedance Resonators," Progress In Electromagnetics Research Letters, Vol. 80, 135-141, 2018.
doi:10.2528/PIERL18102601
http://jpier.org/PIERL/pier.php?paper=18102601

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