Ultra-wideband low-scattering metamaterial based on combination of wave-absorbing material and metasurface

Abstract

The invention discloses an ultra-wideband low-scattering metamaterial based on combination of a wave-absorbing material and a metasurface. The ultra-wideband low-scattering metamaterial mainly solvesthe problem that the scattering cross section reduction frequency band of an existing 10dB radar is narrow. The metamaterial is formed by splicing M*N low-scattering metamaterial units according to achessboard type arrangement mode, and each unit comprises a metal floor (1), a lower dielectric substrate (2) and a pair of L-shaped metal patches (3); the lower surface of the lower dielectric substrate is clung to the upper surface of the metal floor, a safety glass container (4) is arranged on the upper surface of the lower dielectric substrate, and an aqueous solution (5) is filled in the safety glass container to form a water wave-absorbing material unit with the safety glass container; an upper dielectric substrate (6) is arranged right above the lower dielectric substrate, and a pair ofL-shaped metal patches are printed on the upper surface of the upper dielectric substrate and are connected with the metal floor through metallized via holes (7) to form a polarization rotation metasurface structure unit. According to the invention, the reduction frequency band is improved, and the radar scattering cross section reduction in the whole ultra-wide frequency band can be realized.

Description

technical field [0001] The invention belongs to the technical field of microwave materials, in particular to a low-scattering metamaterial, which can be used to reduce the radar scattering cross section of an antenna. Background technique [0002] In the field of radar antennas, the key to improving the scattering characteristics is how to reduce the radar cross section, and the radar cross section is the most basic parameter in the scattering characteristics. It refers to a measure of the return power of a target in a given direction under the illumination of a plane wave. [0003] The antenna is a special kind of scatterer. Its scattering includes two parts: one part is the scattering field of the structural mode item that has nothing to do with the load of the scattering antenna. It is the scattering field when the antenna is connected to a matching load. Its scattering mechanism is the same as that of an ordinary scatterer. ; the other part is the scattered field of the ...

AI Technical Summary

Problems solved by technology

Among them, on the basis of the first measure, a supersurface absorber can be designed by using a large number of lumped resistors or resistor sheets, but the 10dB RCS reduction bandwidth is very narrow; the second measure is to first use the ideal electric conductor PEC and the artificial magnetic conductor The 180-degree phase difference of AMC realizes the reduction of narrow-band radar scattering cross-section, and then designs several metasurfaces composed of different elements with a certain phase difference, such as phase gradient metasurface, encoding metasurface and polarization rotating reflective surface, to achieve broadband The radar cross section is reduced, but its 10dB RCS reduction bandwidth is also very narrow

Therefore, the metasurface based on the above two measures to achieve 10dB RCS reduction bandwidth is very limited, resulting in poor scattering performance of the antenna

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