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PIER PIER B PIER C PIER M PIER Letters
2013-08-28
Compact Differential Bandpass Filter with Improved in-Band Common-Mode Suppression with Loaded T-Shaped Resonators
By
Hui Wang,

    Dr. Hui Wang

    Nanjing University of Science and Technology

    China

    Homepage

Xuan Li,

    Dr. Xuan Li

    Wireless R&D

    Alcatel-Lucent Shanghai Bell

    China

    Homepage

Wei Kang,

    Dr. Wei Kang

    Ministerial Key Laboratory of JGMT

    Nanjing University of Science and Technology

    China

    Homepage

Chen Tan,

    Dr. Chen Tan

    Ministerial Key Laboratory of JGMT

    Nanjing University of Science and Technology

    China

    Homepage

Wen Wu,

    Dr. Wen Wu

    Nanjing University of Science & Technology

    China

    Homepage

Guo Yang

    Dr. Guo Yang

    Nanjing University of Science and Technology

    China

    Homepage

Progress In Electromagnetics Research C, Vol. 43, 79-91, 2013
doi:10.2528/PIERC13072701
Abstract
Compact symmetrical four-ports differential bandpass filters with good common-mode suppressions are proposed in this work. The presented filters are designed based on half-wavelength coupled resonators with compact size, good filtering responses for differential-mode, and wide common-mode suppression range. To further improve the common-mode performances within the differential-mode passband, T-shaped resonators are loaded at the center of the structure. It is noted that, the size of filter does not become larger with loaded T-shaped resonators. Both these two filters are centered at 1.8 GHz for Global System Mobile Communication (GSM) with 7.8% fractional bandwidth. For differential-mode, the insertion is less than -1.2 dB in the 3-dB passband and the matching is better than -20 dB. Good stopband characteristics are also obtained with more than -20 dB out-of-band attenuation from dc to 1.6 GHz in the lower stopband and from 2.0 to 4.8 GHz in the upper stopband. For common-mode, better than -15 dB suppression is achieved within dc to 6.2 GHz and with the help of the loaded T-shaped resonators, the rejection in the differential-mode passband is improved to be more than -40 dB. Theory analysis, simulation, and measurement show good agreement with each other.
Citation
Hui Wang, Xuan Li, Wei Kang, Chen Tan, Wen Wu, and Guo Yang, "Compact Differential Bandpass Filter with Improved in-Band Common-Mode Suppression with Loaded T-Shaped Resonators," Progress In Electromagnetics Research C, Vol. 43, 79-91, 2013.
doi:10.2528/PIERC13072701
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