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Keywords = unloaded quality factor (Qu)

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30 pages, 4811 KB  
Article
Dual-Mode Control in a Single-Cavity SIW Bandpass Filter for High-Q 5.8 GHz WiMAX Using Combined Magnetic–Electric Perturbation
by Sirine Aouine Chaieb, Mahdi Abdelkarim, Majdi Bahrouni and Ali Gharsallah
Signals 2026, 7(3), 43; https://doi.org/10.3390/signals7030043 - 7 May 2026
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Abstract
This paper presents a compact, single-layer substrate-integrated waveguide (SIW) bandpass filter for 5.8 GHz WiMAX applications. The filter achieves an improved performance trade-off through a novel hybrid design strategy that combines central vertical perturbation vias with symmetrically etched complementary split-ring resonators (CSRRs). This [...] Read more.
This paper presents a compact, single-layer substrate-integrated waveguide (SIW) bandpass filter for 5.8 GHz WiMAX applications. The filter achieves an improved performance trade-off through a novel hybrid design strategy that combines central vertical perturbation vias with symmetrically etched complementary split-ring resonators (CSRRs). This configuration implements a hybrid magnetic–electric perturbation within a single cavity, enabling simultaneous control of electric and magnetic field confinement. The proposed topology achieves an optimized balance among unloaded quality factor Qu, insertion loss, selectivity, and structural simplicity. Through targeted intra-cavity field manipulation, the filter attains a Qu of 239.7, a narrow fractional bandwidth of 3.08% (5.75–5.93 GHz), and a low insertion loss of 1.12 dB. It also delivers enhanced selectivity compared to conventional single-cavity designs and performs competitively with multi-resonator architectures. An equivalent circuit model accurately captures the via–CSRR interaction and agrees closely with full-wave electromagnetic simulations. Experimental results confirm excellent return loss and robust performance across the entire WiMAX band (5.725–5.850 GHz). Thus, the proposed filter offers a practical, high-performance, and manufacturable solution for selective RF front-end applications. Full article
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