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2025-06-03
Compact Slow-Wave Folded Substrate Integrated Waveguide with Broadband and Low-Loss Performance
By
Progress In Electromagnetics Research M, Vol. 134, 13-20, 2025
Abstract
This paper presents a novel compact, broadband, and low-loss slow-wave folded substrate integrated waveguide (SW-FSIW) structure, achieved by integrating grounded patches into a conventional FSIW configuration. The slow-wave effect is generated through enhanced capacitive coupling between the grounded patches and the signal trace grid patterned on the FSIW's middle metal layer. Compared to a conventional SIW with the same cutoff frequency, the SW-FSIW achieves a 66% reduction in lateral dimension and a 37% reduction in longitudinal dimension, resulting in a total area reduction of 78.6%. The design exhibits superior performance to state-of-the-art slow-wave SIWs in lateral size reduction, fractional bandwidth (92%), and attenuation constant. Experimental validation shows excellent agreement between measurements and simulations for a fabricated prototype operating across the 4.07-11 GHz frequency range, confirming the structure's strong potential for applications in compact microwave systems, 5G/6G front-ends, and satellite communications.
Citation
Liang Li, Yangping Zhao, Shunli Hong, and Minjin Zhang, "Compact Slow-Wave Folded Substrate Integrated Waveguide with Broadband and Low-Loss Performance," Progress In Electromagnetics Research M, Vol. 134, 13-20, 2025.
doi:10.2528/PIERM25040701
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