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An Investigation of Open- and Short-Ended Resonators and Their Applications to Bandpass Filters

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5 Author(s)
Gao Le Dai ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; Xiu Yin Zhang ; Chi Hou Chan ; Quan Xue
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In this paper, we investigate both open- and short-ended half-wavelength microstrip resonators and their applications to bandpass filter designs. Using voltage-wave analyses, we examine the resonance and coupling properties of these resonators at their fundamental and harmonic frequencies. Loading them with a lumped-circuit element at the locations of zero-voltage point of the second harmonic allows control of fundamental frequency response without altering that of the second harmonic. A resistive loading can suppress the second harmonic while a p-i-n diode loading yield a switchable bandpass filter. The coupling regions between an open-ended resonator and a short-ended resonator of higher order bandpass filters can be chosen such that second-, third-, and fourth-harmonic suppression, as well as dual passband, can be achieved. Simulation and experimental results agree well, validating the proposed bandpass filter design methodology.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:57 ,  Issue: 9 )

Date of Publication:

Sept. 2009

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