Abstract
This article describes a dual-band diffusive metasurface-based reflector, with a specular reflection band together with two sidebands which exhibit low radar cross-section (RCS). A rhombus-shaped patch-ring type of polarizer with dual-band characteristics is chosen as the fundamental unit cell. The polarizer and its mirror structure have opposite phases in the polarization-rotating bands, while their phase is the same in the reflection band, which is juxtaposed in-between the middle of the two polarization-rotating bands. The designed metasurface is constructed, based on the phase cancellation theory, by arranging arrays of these two unit cells in a two-dimensional pattern. The measured results show that the realized metasurface-based reflector achieves a high-efficiency specular window from 26.2 to 38.8 GHz together with two low-RCS sidebands from 18.18 to 24.6 GHz and 40.61 to 56.4 GHz. The proposed diffusive metasurface can be potentially used as a reflector for reflector antennas, which provides a highly efficient in-band radiation together with low backscattering out-of-band.
Highlights
Antenna with reflecting ground can achieve broadband and high-gain characteristics, which attracts great interests [1]
Simulated and measured results are in good agreement, and it proves that the proposed diffusive metasurface as a reflector is an attractive candidate for wideband antenna’s radar cross-section (RCS) reduction, especially at higher frequencies
A diffusion-reflection-diffusion metasurface-based reflector combining the specular reflection band and diffusion scattering bands based on a dual-band polarizer has been proposed in this paper
Summary
Antenna with reflecting ground can achieve broadband and high-gain characteristics, which attracts great interests [1]. An AFSR has been designed by printing a reflective patch on a lossy layer, to introduce a reflection window within the absorption band [13] Another approach has been employed to realize a three-dimensional AFSR [14] by using a series circuit to deactivate the absorber in the desired band. A reflective type 1-bit coding metasurface was reported, and it works as a metallic mirror at the center frequency while diffusing the scattering wave at two sidebands [24]. A wideband metasurface with a diffusion-reflection-diffusion response based on the dual-band polarizer is proposed for the wideband reduction of the antenna’s RCS. Simulated and measured results are in good agreement, and it proves that the proposed diffusive metasurface as a reflector is an attractive candidate for wideband antenna’s RCS reduction, especially at higher frequencies
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