A compact elliptical substrate integrated waveguide balanced bandpass filter with high-selectivity

Zuxue Xia, Rui Cheng, Wenhai Xia, Xin Cao, Xin Xiong and Jiayuan Hu

Journal of Electromagnetic Waves and Applications, 2025, vol. 39, issue 8, 864-876

Abstract: A novel quarter-mode elliptical substrate integrated waveguide resonator (QMESIWR) is proposed to design a compact balanced bandpass filter (BPF) with high selectivity. Metal columns are integrated to enhance common-mode suppression. By leveraging source-load coupling (SLC), spurlines, and coupled bandgaps, five transmission zeros (TZs) are generated outside the passband, improving frequency selectivity. C-slot lines and gap coupling strengthen dual-resonator coupling, further optimizing performance. Measurements align with simulations, demonstrating operation at 4.2 GHz (3 dB bandwidth: 180 MHz) with >27 dB in-band common-mode suppression and >70.8 dB out-of-band suppression. This design proves suitable for complex modern electromagnetic environments.

Date: 2025
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DOI: 10.1080/09205071.2025.2482775

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