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2013-12-25

Design of a Compact and High Selectivity Tri-Band Bandpass Filter Using Asymmetric Stepped-Impedance Resonators (Sirs)

By Jun Li, Shan Shan Huang, and Jian Zhong Zhao
Progress In Electromagnetics Research Letters, Vol. 44, 81-86, 2014
doi:10.2528/PIERL13112502

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


Jun Li, Shan Shan Huang, and Jian Zhong 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
http://jpier.org/PIERL/pier.php?paper=13112502

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