Design of polarization insensitivity wideband metamaterial absorber using the resistor based square-shaped structure

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Abstract In this paper, we have explored a compact wideband metamaterial absorber unit-cell structure comprises four square-shaped conducting patches of copper and connected with four lumped resistors supported by FR-4 as a substate material which followed by conducting ground plain in the microwave (4 GHz to 15GHz) regime of the spectrum. The proposed structure has been analysed and simulated using CST Studio Suite a commercial simulated based on finite integration techniques to yield several performance metrics for comprehensive understanding of broad-spectrum absorbers. The proposed wideband metamaterial absorber is polarization insensitive due to its symmetric structure under a normal incident angle and has potential applications for the radar cross-section (RCS) reduction, target stealth, and electromagnetic wave protection. Further, the proposed structure has been fabricated and tested experimentally, and the achieved results are comparable with that of the simulation results.

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