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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2013-12-25
Design of a Compact and High Selectivity Tri-Band Bandpass Filter Using Asymmetric Stepped-Impedance Resonators (SIRs )
By
Jun Li,

    Dr. Jun Li

    School of Electronic and Optical Engineering

    Nanjing University of Science and Technology

    China

    Homepage

Shan Shan Huang,

    Dr. Shan Shan Huang

    School of Electronic and Optical Engineering

    Nanjing University of Science and Technology

    China

    Homepage

Jian Zhong Zhao

    Dr. Jian Zhong Zhao

    School of Electronic and Optical Engineering

    Nanjing University of Science and Technology

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 44, 81-86, 2014
doi:10.2528/PIERL13112502 | Google Scholar

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.
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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
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