Abstract
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.
Highlights
A new method has been proposed in[2,3] based on wave redirecting concept by combination of artificial magnetic conductors (AMC) and perfect electric conductors (PEC) tiles in chessboard like configuration
Another method of radar cross section (RCS) reduction is using of polarization conversion metasurfaces (PCM) that convert the incident waves to its cross-polarized ones which can employ to scattered waves cancellation[13,14,15]
Based on the best author knowledge, the RCS reduction bandwidth of the proposed metasurface is significantly higher than the early published references such as[11,12]. In addition to this ultra wideband RCS reduction bandwidth, the proposed metasurface has very light weight which is due to using ultra thin FR-4 substrate with 0.25 mm thickness and air gap
Summary
A polarization conversion metasurface (PCM) is designed for ultra wideband radar cross section (RCS) reduction. Authors proposed two and three layers AMC metasurface with 108% and 109% RCS reduction, respectively[11,12] Another method of RCS reduction is using of polarization conversion metasurfaces (PCM) that convert the incident waves to its cross-polarized ones which can employ to scattered waves cancellation[13,14,15]. A thin, low cost, light weight, and ultra wideband polarization conversion metasurface is designed to achieve ultra wideband RCS reduction In this structure, the double-heads arrow unit cell array and its mirrors create 180° phase difference at both x and y directions which results in scattered wave cancellation and RCS reduction in normal directions for ultra-wide bandwidth from 9 to 40 GHz, 126.5%. The 10-dB RCS reduction bandwidth of the proposed surface is more than 63% for TE polarization and more than 32% for TM ones up to 50° incident angles
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