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COMPACT TRI-BAND BANDPASS FILTER BASED ON HYBRID RESONATOR WITH IMPROVED SELECTIVITY PERFORMANCES

By S. Yang, J. Z. Chen, B. Wu, and C.-H. Liang

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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:
S. Yang, J. Z. Chen, B. Wu, and C.-H. 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

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