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PIER PIER B PIER C PIER M PIER Letters
2010-01-04
Novel Miniaturized Bandpass Filters Using Spiral-Shaped Resonators and Window Feed Structures
By
Gao-Le Dai,

    Dr. Gao-Le Dai

    Department of Information Science and Electronic Engineering

    Zhejiang University

    China

    Homepage

Mingyao Xia

    Prof. Mingyao Xia

    School of Electronics Engineering and Computer Science

    Peking University

    Homepage

Progress In Electromagnetics Research, Vol. 100, 235-243, 2010
doi:10.2528/PIER09120401
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
Gao-Le Dai, and Mingyao 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
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