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PIER PIER B PIER C PIER M PIER Letters
2022-03-31
Tri-Band Bandpass Filter Using Mixed Short/Open Circuited Stubs and q -Factor with Controllable Bandwidth for WAS, ISM, and 5G Applications
By
Omar Christian Massamba,

    Dr. Omar Christian Massamba

    School of Sciences and Techniques, Electrical and Electronics Engineering Laboratory

    Marien Ngouabi University

    Congo

    Homepage

Pierre Moukala Mpele,

    Dr. Pierre Moukala Mpele

    Department of Electrical Engineering

    Pan African University Institute of Basic Sciences Technology and Innovation (PAUSTI)

    Kenya

    Homepage

Franck Moukanda Mbango,

    Prof. Franck Moukanda Mbango

    Marien Ngouabi University

    Congo

    Homepage

Desire Lilonga-Boyenga

    Dr. Desire Lilonga-Boyenga

    Universite Marien Ngouabi

    Republic of the Congo

    Homepage

Progress In Electromagnetics Research C, Vol. 119, 177-190, 2022
doi:10.2528/PIERC22012713
Abstract
Designing a multi-band bandpass filter (BPF) with controllable bandwidths is an alternative process to several technologies suggested by researchers. Hence, this paper presents a tri-band BPF in microstrip technology where T-shaped short-and-open stubs have alternating positions to use the maximally flat theory, based on the overall ABCD parameters of the circuit. The combination of the design Q-factor and the operating frequency to mismatch the design is the technique basis. The proposed structure comprises the quarter wavelength (λ/4) line section to develop a tri-band BPF frequency. All stubs are symmetrical relative to the center axis, while the prototype has been fabricated on a wafer of 22.42x7.62 mm2. Using an FR4 HTG-175 with a thickness of 1-mm, dielectric constant εr=4.4, and loss tangent tanδ=0.02, the (4.06-4.283) GHz, (5.877-6.408) GHz, and (14.281-14.589) GHz are obtained referring to a 10-dB of the return loss. In contrast, the insertion losses at the center frequencies are 2.107/1.354/4.08 dB and the fractional bandwidths of 2.134%, 5.346%, and 8.645%, respectively. These covers WAS (including RLAN), ISM, and 5G applications. However, the attenuation coefficient is between 1.326 dB and 4.368 dB. The tri-band BPF prototype was validated using the Anritsu MS4642B 20 GHz Vector Network Analyzer. The measured and E-simulated results have been compared with good agreement.
Citation
Omar Christian Massamba, Pierre Moukala Mpele, Franck Moukanda Mbango, and Desire Lilonga-Boyenga, "Tri-Band Bandpass Filter Using Mixed Short/Open Circuited Stubs and q -Factor with Controllable Bandwidth for WAS, ISM, and 5G Applications," Progress In Electromagnetics Research C, Vol. 119, 177-190, 2022.
doi:10.2528/PIERC22012713
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