Design and experimental performance analysis of a low-profile dual-band microwave absorber

Kd. M. Raziul Islam, Ardavan Rahimian, Gabriel G. Machado, Muhammad Ali Babar Abbasi and Adnan Ahmad Cheema

Journal of Electromagnetic Waves and Applications, 2025, vol. 39, issue 9, 1064-1077

Abstract: This work investigates the design and experimental analysis of a compact dual-band absorber (DBA) for polarization-independent wideband operation in both the X and Ku bands. The proposed absorber unit-cell consists of inverted flag-shaped elements arranged in four quadrants and four edge-touching rectangular patches, with a square patch at the center on its top level. The bottom ground plane is a continuous metal plate, while a 1.6 mm thick FR4 substrate separates the top and bottom components. The full-wave simulation results exhibit a wide absorption response, with absorptivity exceeding 90% for all polarization angles under normal incidence. The dual bandwidth can be controlled by tuning the structural parameters. A prototype of the DBA was tested, and its measured outputs aligned well with the full-wave simulations. The proposed DBA offers outstanding merits, such as a thin single-layer configuration, no air gap, reduced lumped resistors, enhanced absorption bandwidth, and polarization insensitivity.

Date: 2025
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DOI: 10.1080/09205071.2025.2493172

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