Vol. 21

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2011-04-19

Microstrip Bandpass Filters Using Dual-Mode Resonators with Internal Coupled Lines

By Changzhou Hua, Chunhong Chen, Chen Miao, and Wen Wu
Progress In Electromagnetics Research C, Vol. 21, 99-111, 2011
doi:10.2528/PIERC11031003

Abstract

This paper presents a new dual-mode stub-loaded resonator, which consists of a microstrip resonator with internal coupled lines and an open-circuit stub. Based on the odd- and even-mode equivalent circuits, the resonant characteristics of the proposed microstrip resonator are investigated. It is found that the fundamental even-mode resonant frequency of the proposed resonator can be flexibly controlled while the fundamental odd-mode resonant frequency remains unaffected. Then, based on the proposed resonator, three compact dual-mode bandpass filters, namely filer A, filter B and filter C, are designed, fabricated and measured to validate the design concept. Filters A and B demonstrate opposite asymmetric responses with two transmission poles in the passband and a transmission zero in the stopband. Filter C has three transmission poles in the passband and two transmission zeros respectively in the lower and upper stopbands to enhance selectivity. The experimental results show excellent agreement with the theoretical simulation results.

Citation


Changzhou Hua, Chunhong Chen, Chen Miao, and Wen Wu, "Microstrip Bandpass Filters Using Dual-Mode Resonators with Internal Coupled Lines," Progress In Electromagnetics Research C, Vol. 21, 99-111, 2011.
doi:10.2528/PIERC11031003
http://www.jpier.org/PIERC/pier.php?paper=11031003

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