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Progress In Electromagnetics Research Letters
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DESIGN OF A COMPACT AND HIGH SELECTIVITY TRI-BAND BANDPASS FILTER USING ASYMMETRIC STEPPED-IMPEDANCE RESONATORS (SIRS)

By J. Li, S. S. Huang, and J. Z. Zhao

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Abstract:
In this article, a compact tri-band microstrip bandpass filter (BPF) using asymmetric stepped-impedance resonators (SIRs) is proposed. Only one set of asymmetric SIRs are used in designing this filter to achieve triple passband response with high selectivity and band-to-band isolation level. By properly selecting the impedance and electrical length ratios of the asymmetric SIRs, the tri-band BPF is designed. By using a cross-coupled configuration and 0˚ feed structure, high selectivity frequency responses with six transmission zeros are achieved. The three bands of the proposed tri-band filter are located at 1.57/3.9/7 GHz, respectively, and the circuit size is much smaller in comparison with previous works using the same substrate. Measured results are in good agreement with electromagnetic (EM) simulation.

Citation:
J. Li, S. S. Huang, and J. Z. Zhao, "Design of a Compact and High Selectivity Tri-Band Bandpass Filter Using Asymmetric Stepped-Impedance Resonators (Sirs)," Progress In Electromagnetics Research Letters, Vol. 44, 81-86, 2014.
doi:10.2528/PIERL13112502

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