Wideband bandpass filter with ultra-wide stopband based on cross-shaped parallel coupled lines

Litian Wang, Xuan Chen, Weicheng Peng, Lirong Qian, Cuiping Li, Yahui Tian, Honglang Li, Dan Li, Lin Miao, Yang Xiong and Xiaokun Bi

Journal of Electromagnetic Waves and Applications, 2024, vol. 38, issue 8, 913-927

Abstract: A broadband out-of-band rejection capability and multiple transmission zeros of wideband bandpass filter are proposed and validated in this article, which employ quadruple anti-parallel coupled-line structures to form a novel cross-shaped resonator planar topology. The centered frequency of the single wideband bandpass filter designed for verification is located at 2.4 GHz (f0) with a fractional bandwidth of 50%. The interaction of crossed multiple anti-coupled lines with a lowpass-loaded fan constitutes the wideband with nine transmission zeros in the 5 f0 frequency range for improved suppression extending to 26.5 GHz (10.7 f0) with a suppression level of 12.5 dB. Moreover, the designed prototype filter is implemented and tested with a measured minimum insertion loss of 0.9 dB. Good agreement between the measured and simulated results is attained to successfully validate the correctness of the proposed design approach.

Date: 2024
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DOI: 10.1080/09205071.2024.2350426

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