Low Insertion-Loss, and Wideband Dual-Mode Bandpass Filters with Dual Perturbation Elements

Shih-Bin JHONG
Min-Hang WENG
Sean WU
Cheng-Yuan HUNG
Maw-Shung LEE

IEICE TRANSACTIONS on Electronics   Vol.E91-C    No.1    pp.117-119
Publication Date: 2008/01/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.1.117
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
bandpass filter,  microstrip,  square ring resonator,  dual mode,  transmission zero,  

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A novel low insertion-loss and wideband microstrip bandpass filter has been designed and tested. The basic configuration of this novel dual-mode filter is a square ring resonator with direct-connected orthogonal feed lines, and dual-perturbation elements are introduced within the resonator at symmetrical location. The effects of the size of the perturbation element are studied. A new filter having wider bandwidth and transmission zeros are presented. The proposed filter responses are in good agreement with the simulations and experiments.