ArticleScientific reports2026
A high-selectivity 24-GHz SIW-DGS-CPW bandpass filter with wide stopband rejection for automotive radar and ADAS.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
A performance-efficient compact, highly selective 24 GHz SIW-based bandpass filter (BPF) is proposed for automotive radar and advanced driver-assistance systems (ADAS). The key contribution is a single-layer SIW-DGS-CPW co-design in which SIW cavities provide a high-Q passband, an open-rectangular DGS introduces transmission zeros to steepen the skirts and reinforce the stopband, and a CPW feeding transition improves matching and practical integration. Implemented on a substrate of Rogers RO4003C with [Formula: see text] and thickness of 0.508 mm, the prototype occupies [Formula: see text], achieving a pronounced miniaturization while maintaining strong spectral selectivity. Full-wave simulations and measurements confirm a center frequency of 23.97 GHz and a 450-MHz 3-dB bandwidth, with return loss better than 24 dB and an in-band insertion loss of 1.6-2.0 dB ([Formula: see text]). The filter exhibits sharp roll-off with a measured 40-dB rejection within ± (0.8-1.2) GHz from [Formula: see text], and 30-35 dB suppression across 20-30 GHz. A compact equivalent-circuit model captures the passband behavior and transmission zeros. Thermal analysis (25-105 °C) shows only a slight downshift (~ 30 MHz) with minimal performance degradation, supporting automotive reliability. Compared with prior 24-GHz BPFs, the proposed co-integration simultaneously improves skirt selectivity and wide stopband suppression within a compact footprint.
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