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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2020-02-02
T-Shaped I/O Feed Based Differential Bandpass Filter with Symmetrical Transmission Zeros and High Common Mode Rejection Ratio
By
Rida Gadhafi,

    Dr. Rida Gadhafi

    Khalifa University, Masdar Institute

    United Arab Emirates

    Homepage

Dan Cracan,

    Dr. Dan Cracan

    Khalifa University, Masdar Institute

    United Arab Emirates

    Homepage

Ademola Akeem Mustapha,

    Dr. Ademola Akeem Mustapha

    Khalifa University, Masdar Institute

    United Arab Emirates

    Homepage

Mihai Sanduleanu

    Dr. Mihai Sanduleanu

    Khalifa University, Masdar Institute

    United Arab Emirates

    Homepage

Progress In Electromagnetics Research M, Vol. 89, 141-149, 2020
doi:10.2528/PIERM19111804 | Google Scholar

Abstract
A T-shaped feed based differential microstrip bandpass filter (BPF) with high common-mode (CM) rejection ratio is presented. The filter comprises two magnetically coupled conventional square open-loop resonators (SOLR), with capacitive coupled T-shaped input-output (I/O). The choice of the T-shaped I/O coupling feed enables a higher common-mode suppression of -57 dB at f0d that extends up to 4.1f0d with a value better than -30 dB. Frequency f0d is the cutoff frequency of the differential-mode (DM) passband. Moreover, this feed can symmetrically position two transmission zeros (TZs) at the upper and lower stopbands. This yields a highly selective and compact filter. Additionally, a T-shaped feed only excites the odd mode of the filter resulting in a wide stopband with high out of band rejection. The upper and stopband rejection of the filter is better than -50 dB. To demonstrate the design, DM and CM lumped models of the filter are proposed and studied. The filter operates at 1.263 GHz with a fractional bandwidth (FBW) of 3.9%. The design is validated experimentally by characterizing DM, CM, common-mode to differential-mode (CD), and differential-mode to common mode (DC). Moreover, the group delay (GD) response of the filter is measured, and a significantly flat response is observed with a maximum delay variation of only 0.88 ns in the 3 dB bandwidth.
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Citation
Rida Gadhafi, Dan Cracan, Ademola Akeem Mustapha, and Mihai Sanduleanu, "T-Shaped I/O Feed Based Differential Bandpass Filter with Symmetrical Transmission Zeros and High Common Mode Rejection Ratio," Progress In Electromagnetics Research M, Vol. 89, 141-149, 2020.
doi:10.2528/PIERM19111804
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