Abstract
In this paper, a circularly polarized antenna with a low radar cross section (RCS) based on nonuniform metasurfaces is proposed. The metasurface is composed of four elements, which are arranged orthogonally in a <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$2\times 2$</tex> array. Each element is a nonuniform metasurface of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$4 \times 4$</tex> metallic patches. By feeding with a 90° phase difference, the antenna achieves circular polarization radiation. For the radiation case, simulated results show that the proposed antenna possesses a -10 dB impedance bandwidth of 47.05%, 3 dB axial ratio of 42.35%. The peak gain of the antenna reached 12.74 dBic. For the scattering case, the RCS reduction under normal incidence is higher than 6 dB in the operating frequency band of the antenna.
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