A Wideband Polarization Conversion Absorber for Electromagnetic Cloaking Applications
This paper presents the design, analysis, and implementation of a wideband polarization conversion absorber (PCA) metasurface for electromagnetic cloaking applications. The proposed unit-cell consists of a centered elliptical slotted ring resonator with four-petal structures printed on an FR4 dielec...
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| Format: | article |
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2026
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| Online Access: | https://hdl.handle.net/11073/33462 |
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| Summary: | This paper presents the design, analysis, and implementation of a wideband polarization conversion absorber (PCA) metasurface for electromagnetic cloaking applications. The proposed unit-cell consists of a centered elliptical slotted ring resonator with four-petal structures printed on an FR4 dielectric substrate. A grounded foam layer is used to improve matching and enhance bandwidth, while providing mechanical support. A wide bandwidth from 3.4 GHz to 10.2 GHz is obtained for an absorption conversion ratio (ACR) ≥ 90%, with practical overlapped RCS reduction and cloaking performance achieved over 4.0–9.5 GHz across planar, curved, and 3D configurations. A theoretical analysis and parametric study are developed to optimize the PCA unit-cell’s performance. The optimized design is fabricated and tested. PCA metasurfaces are designed for radar cross-section (RCS) reduction via co-polarized reflection suppression, achieved through high cross-polarization conversion and minimal co-polarized reflection (evaluated under matched polarization conditions). Next, a sequential arrangement of different sizes of PCA supercells is investigated for RCS reduction from planar and curved surfaces. For the 10×10 supercell, an RCS reduction exceeding −25 dBsm is observed over a broad angular range from −30◦ to 30◦. The 5 × 5 supercell also achieves significant RCS reduction, exceeding −15 dBsm within an angular range of −25◦ to 25◦. The cloaking performance of the PCA metasurface is further investigated when applied to cubical, cylindrical, and rhombus-shaped PEC objects by evaluating the reduction in the RCS from these objects. |
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