A Compact C-CMRC Feeding Open-Loop Resonator for Harmonic Rejection Bandpass Filter

Jianzhong GU  Xiaowei SUN  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.9   pp.1365-1367
Publication Date: 2006/09/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.9.1365
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
bandpass filter,  compensated compact microstrip resonant cell (C-CMRC),  open-loop resonator,  harmonic suppression,  

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A compact open-loop resonator bandpass filter is presented to suppress the spurious passband using compensated compact microstrip resonant cell (C-CMRC) feeding structure. Based on the inherently compact and stopband characteristics of the C-CMRC feeding, the proposed filters shows a better spurious rejection performance than the only open-loop resonator filter. The suppression is -57.4 dB, -49.5 dB, and -43.9 dB at the 2nd, 3rd and 4th harmonic signal separately. All the performance of proposed filters have been verified by the measured results.