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2015-07-14
Compact Tri-Band Bandpass Filter Based on Hybrid Resonator with Improved Selectivity Performances
By
Progress In Electromagnetics Research C, Vol. 58, 117-123, 2015
Abstract
A novel microstrip tri-band bandpass filter is proposed and implemented using hybrid resonator with independently controllable center frequencies and good in-between isolation. This hybrid resonator is constructed by a stepped-impedance stub resonator and a single end shorted resonator. The stepped-impedance stub resonators are applied to achieve the first and second passband, while the third passband is implemented by single end shorted resonators. By applying the even-odd mode approach, the resonance frequency ratio between even mode and odd mode inside the stepped-impedance stub resonators is attained. Furthermore, the filter with multi-path coupling structure can generate the transmission zeros at the edge of the passband, which can effectively improve the filter passband selectivity. Finally, a tri-band filter operating at 1.91, 2.73, and 3.45 GHz is designed and fabricated. The measurement results accord well with the full-wave electromagnetic designed responses.
Citation
Shuai Yang Jian Zhong Chen Bian Wu Chang-Hong Liang , "Compact Tri-Band Bandpass Filter Based on Hybrid Resonator with Improved Selectivity Performances," Progress In Electromagnetics Research C, Vol. 58, 117-123, 2015.
doi:10.2528/PIERC15051802
http://www.jpier.org/PIERC/pier.php?paper=15051802
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