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Progress In Electromagnetics Research
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DESIGN OF TRIPLE-MODE BANDPASS FILTER USING IMPROVED HEXAGONAL LOOP RESONATOR

By S.-G. Mo, Z.-Y. Yu, and L. Zhang

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Abstract:
A novel triple-mode hexagonal bandpass filter with capacitive loading stubs is introduced in this article. The technique, adding an open capacitive stub, is applied to enlarge the equivalent self-capacitance of the resonator, which declines its resonant frequencies. Three radial-line stubs in the center of top layer are used to implement this technique. One mode resonant frequency is varied with the radii of three radial-line stubs, while the other two modes are nearly not affected. This filter has a pair of transmission zeros which are close to the passband, thus it behaves with high selectivity. For method validation, a bandpass filter operating at 2.4 GHz is fabricated and measured. The experimental results are demonstrated and discussed.

Citation:
S.-G. Mo, Z.-Y. Yu, and L. Zhang, "Design of triple-mode bandpass filter using improved hexagonal loop resonator," Progress In Electromagnetics Research, Vol. 96, 117-125, 2009.
doi:10.2528/PIER09080304
http://www.jpier.org/PIER/pier.php?paper=09080304

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