In this paper, a polarization conversion metasurface (PCM) is designed for ultra wideband radar cross section (RCS) reduction. The proposed polarization conversion metasurface consists of double-heads arrow unit cell with its 90°, 180° and 270° rotated ones to create the destructive interferences cancellation and radar cross section (RCS) reduction, consequently. The proposed metasurface demonstrates ultra-wide band 10-dB RCS reduction from 9 to 40 GHz (126.5%) for normally TM- and TE- polarized incident waves. The good agreement between the simulation and measurement results at 0°, 20° and 40° incident angles prove the idea, also. The ultra wideband RCS reduction of the proposed metasurface as well as its low profile, light weight and low cost prove its high capability compared with the state of the art references.

A new thin planar wideband radar cross section (RCS) surface is designed and fabricated by using two different artificial magnetic conductor (AMC) unit cells. These AMC unit cells are designed by both substrate height and relative permittivity variations to achieve an ultra wide bandwidth performance. Three layer low cost FR-4 substrates are used to simply implement these unit cells. The proposed structure reduces the RCS more than 10 dB from 13.1 GHz to 44.5 GHz (109% bandwidth), more than 20 dB from 16.43 GHz to 42.31 GHz (88.3%), and more than 30 dB from 24.7 GHz to 40.9 GHz (49.4%). Moreover, this surface has more than 103% RCS reduction bandwidth for TE polarized and more than 93% for TM polarized ones up to 50° oblique incident waves. The good agreement between the simulation and measurement results also prove the idea. In addition to using a low cost substrate, the proposed surface has a significant widest RCS reduction bandwidth compared with the state of the art references in the normal and oblique incident angles at both TE and TM polarizations.

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A planar low cost and thin metasurface is proposed to achieve ultra-wideband radar cross section (RCS) reduction with stable performance with respect to polarization and incident angles. This metasurface is composed of two different artificial magnetic conductor unit cells arranged in a chessboard like configuration. These unit cells have a Jerusalem cross pattern with different thicknesses, which results in wideband out-phase reflection and RCS reduction, consequently. The designed metasurface reduces RCS more than 10-dB from 13.6 GHz to 45.5 GHz (108% bandwidth) and more than 20-dB RCS from 15.2 GHz to 43.6 GHz (96.6%). Moreover, the 10-dB RCS reduction bandwidth is very stable (more than 107%) for both TE and TM polarizations. The good agreement between simulations and measurement results proves the design, properly. The ultra-wide bandwidth, low cost, low profile, and stable performance of this metasurface prove its high capability compared with the state-of-the-art references.

This study proposes a quasi-fractal polarisation conversion metasurface (PCM) for ultra-wideband radar cross-section reduction (RCSR). The simple and proposed metasurface is composed of double-heads arrowed-like unit cell benefited from the second iteration Koch fractal in its arm and cut-line to broaden the bandwidth. Consequently, this PCM unit cell and its 90, 180 and 270 degrees rotated counterparts obtain destructive interference cancellation between their reflected waves and RCSR. The proposed metasurface demonstrates 10-dB RCSR from 7.68 to 40.87 GHz (136.73%) for normal incident waves, and more than 96.7% up to 40 degrees incident angle that verifies the large range incident angle RCSR of the surface. The experimental measurement results at the normal incident angle and their comparison with simulation ones prove the idea.