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Articles

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

, , , , , , , , , & show all
Pages 913-927 | Received 13 Jan 2024, Accepted 21 Apr 2024, Published online: 08 May 2024
 

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.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is supported by the Guangzhou Key Research & Development Program, Major Science and Technology Projects [grant number 202206070001] the Research and Development Program in Significant Area of Guangdong Province [grant number 2020B0101040002]. The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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