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Progress In Electromagnetics Research
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NOVEL MINIATURIZED BANDPASS FILTERS USING SPIRAL-SHAPED RESONATORS AND WINDOW FEED STRUCTURES

By G. Dai and M. Xia

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Abstract:
In this paper, we present a new class of miniaturized microstrip bandpass filters with low-insertion loss, sharp-rejection and narrow-band performance. The proposed filters are composed of two spiral-shaped resonators and rectangle window feed structures. Both back-to-back and interdigital combinations of the resonators are adopted to obtain the miniaturized filter size. Compared to the traditional square loop bandpass filter, the sizes are reduced by 82% and 80%. It is also found that there is a pair of transmission zeros located on each side of the passbands, resulting in high selectivity. To validate the proposed idea, two demonstration filters with back-to-back and interdigital spiral-shaped resonators are implemented. The measured results exhibit good agreement with the full-wave simulation results.

Citation:
G. Dai and M. Xia, " novel miniaturized bandpass filters using spiral - shaped resonators and window feed structures ," Progress In Electromagnetics Research, Vol. 100, 235-243, 2010.
doi:10.2528/PIER09120401
http://www.jpier.org/PIER/pier.php?paper=09120401

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