Ultra-wideband RCS reduction metasurface based on mutual superposition of polarization conversion bandwidths

Abstract

The invention belongs to the field of electromagnetic metamaterials, and relates to a low-RCS metasurface, in particular to an ultra-wideband RCS reduction metasurface based on mutual superposition of polarization conversion bandwidths, which is characterized by comprising an upper dielectric substrate (4), a lower dielectric substrate (5) and a metal reflecting plate (3) which are distributed at intervals from top to bottom, a low-frequency metasurface structure (1) of a lumped resistor is loaded on the upper surface of the upper-layer dielectric substrate (4), and a high-frequency metasurface structure (2) is arranged on the upper surface of the lower-layer dielectric substrate (5); and a low-frequency polarization conversion unit (111) in the low-frequency metasurface structure (1) and a high-frequency polarization conversion module (211) at the corresponding position in the high-frequency metasurface structure (2) form an overall polarization conversion unit (6), and coupling parameters are changed by adjusting the interval, shape and layout of low-frequency units and high-frequency units, so that the overall polarization conversion unit (6) obtains broadband polarization conversion. According to the invention, the bandwidth of RCS reduction is broadened, the angle stability of the metasurface is improved, and stable RCS reduction of more than 10dB in an ultra-wide frequency band can be realized under large-angle incidence of electromagnetic waves.

Description

technical field [0001] The invention belongs to the field of electromagnetic metamaterials, and relates to a low RCS metasurface, in particular to an ultra-wideband RCS reduction metasurface based on superposition of polarization conversion bandwidths, which can be used for electromagnetic structures that require radar scattering cross section reduction. Background technique [0002] With the continuous development of radar detection technology, the demand for electromagnetic stealth technology of various electromagnetic equipment is getting higher and higher. Radar cross section (RCS) is the most important concept in electromagnetic stealth technology, which characterizes the ability of the target to scatter electromagnetic waves in the direction of radar reception. Generally speaking, the size of the radar cross section is related to the material, shape, orientation of the target, and the frequency and polarization of the electromagnetic wave. The most commonly used means...

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Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art and provide a novel ultra-wideband RCS reduction metasurface based on the overlapping of polarization conversion bandwidths, so that Broaden the bandwidth of polarization conversion, effectively improve the angle stability, and improve the problem of using the polarization conversion structure to widen the bandwidth of RCS reduction and improve the angle stability.

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