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2015-03-04
Novel Tri-Band Bandpass Filter with High Selectivity
By
Liangzu Cao,

    Professor Liangzu Cao

    School of Mechanical and Electronic Engineering

    Jingdezhen Ceramic University

    China

    Homepage

Lixia Yin

    Dr. Lixia Yin

    School of Mechanical and Electric Engineering

    Jingdezhen Ceramic University

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 51, 127-133, 2015
doi:10.2528/PIERL14121302 | Google Scholar

Abstract
This paper presents a tri-band bandpass filter (BPF) consisting of a wide BPF and two narrow bandstop filters (BSFs). BPF is a ninth-order interdigital structure, and BSFs are designed fifth-order series resonators with quarter wavelength transmission line connected. The selectivity of BPF and the bandwidth of BSF are analyzed using simulation software. A tri-band BPF, made of metal cavities, is designed and measured. Three passbands are located in 1.332~1.401 GHz, 1.443~1.458 GHz, 1.506~1.660 GHz, and insertion losses in passbands are less than 2.1 dB. Ratios of Δf40 dB /Δf3 dB are 1.9, 2.67 and 1.33, respectively, and isolation between passbands is more than 75 dB. The good agreement between the simulated and measured results validated the proposed structure.
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Citation
Liangzu Cao, and Lixia Yin, "Novel Tri-Band Bandpass Filter with High Selectivity," Progress In Electromagnetics Research Letters, Vol. 51, 127-133, 2015.
doi:10.2528/PIERL14121302
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