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Two-mode bandpass filter using open stub loaded resonator |
Tao LEI1,Tianyu XIANG2,Anjiang LU1,Man PENG1,2,Zhengping ZHANG1( ) |
1. College of Electronics and Information Engineering, Guizhou University, Guiyang 550000, China
2. School of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang 550000, China |
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Abstract Having the advantages of compact sizes, high Qs and low radiation losses, square ring resonators have been widely used to design filters, mixers, oscillators, and antennas. A stub-loaded ring resonator was developed to design dual-mode filters. The developed dual-mode resonator was found to have the advantage that the even-mode resonant frequencies can be flexibly controlled whereas the odd-mode resonant frequencies are fixed. Stepped impedance line is adopted to achieve strong coupling between the input/output (I/O) and the resonator, increasing the bandwidth of the filter. The center frequency of the new filter is 4.97GHz, with the minimum insertion of 1.33dB in passband and the 3dB fractional bandwidth of 9.38%. The results also show that the filter possesses a quasi-elliptic response which improves the stopband rejection.
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two-mode filter
square ring resonator
open stub
stepped impedance line
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Issue Date: 15 January 2014
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2014,
Vol. 54
