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Progress In Electromagnetics Research C
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MINIATURIZED WIDEBAND BANDPASS FILTER UTILIZING SQUARE RING RESONATOR AND LOADED OPEN-STUB

By K. Deng, J. Z. Chen, B. Wu, T. Su, and C.-H. Liang

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Abstract:
In this paper, a miniaturized wideband bandpass filter utilizing a square ring resonator and loaded open-stubs is proposed. One pair of bent open-stubs characterized as perturbations is installed outside the diagonal corners of the ring, and another pair of loaded open-stubs is added inside the ring resonator. By stretching the perturbation stubs more than half-wavelength of the ring, three pairs of degenerated modes in a ring are split for wideband operation. The first two split modes form the dominant passband. Meanwhile, the loading effect introduced by the loaded open-stubs could move the third split mode into the dominant passband, at the same time, an additional transmission zero is generated by the loaded open-stub, which improves the skirt selectivity. Due to the applying of the perturbation stubs as long as more than half-wavelength, this kind of wideband microstrip ring resonator filter occupies a smaller size than those conventional ones that based on ring resonator. To verify the mechanism above, a wideband bandpass filter centered at 3.5 GHz is designed, implemented, and fabricated. Measured results of experimental circuit show good agreement with simulated responses.

Citation:
K. Deng, J. Z. Chen, B. Wu, T. Su, and C.-H. Liang, "Miniaturized Wideband Bandpass Filter Utilizing Square Ring Resonator and Loaded Open-Stub," Progress In Electromagnetics Research C, Vol. 39, 179-192, 2013.
doi:10.2528/PIERC13032706

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