Ultra-broadband full-polarization full-angle rotating parabolic gradient electromagnetic stealth metasurface and its design method

Abstract

The invention belongs to the technical field of radar scattering cross section shrinkage stealth, and in particular relates to an ultra-wideband full polarization full-angle rotating parabolic gradient electromagnetic stealth super-surface and a design method thereof. According to the invention, the electromagnetic stealth device is a rotational parabolic gradient digital super-surface of a finite size, and consists of L*M parabolic gradient modules (subarrays) with the same cycle but different phases, wherein the modules are arranged according to a random sequence; a 1-bit digital super-surface, a 2-bit digital super-surface and a 3-bit digital super-surface are comprised; and the modules consist of basic units. The design method comprises the steps of the design of the topology and phase distribution of each module in the multi-bit rotational parabolic gradient digital super-surface, the design of the ultra-wideband unit structure of the multi-bit rotational parabolic gradient digital super-surface, and the modeling of the multi-bit rotational parabolic gradient digital super-surface. The electromagnetic stealth super-surface provided by the invention has the excellent characteristics of good robustness, super-wide working bandwidth, thin thickness, easy processing and the like.

Description

technical field [0001] The invention belongs to the field of radar scattering cross-section (RCS) reduction stealth technology, and specifically relates to a fully polarized, full-angle ultra-wideband electromagnetic stealth device and a design method based on a rotating parabolic gradient digital metasurface. Background technique [0002] Invisibility is an eternal topic, which has existed in myths, legends and novels for hundreds of years, such as Harry Potter's invisibility cloak. The so-called electromagnetic stealth means that the signal characteristics of the target cannot be detected and identified by radar and other detection equipment within a certain electromagnetic frequency range, thereby forcing the enemy's electronic detection system and weapon platform to reduce combat effectiveness and improve the penetration capability and survival of our weapons. ability. At present, scientists from all over the world are working on new mechanism stealth research. Accordin...

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Problems solved by technology

Diffuse reflection stealth technology is not limited by the stealth area and materials, and is light in weight, and the ultra-thin cloak can conform to the surface of any weapon platform through shaping technology. They are all composed of the same basic unit (uniform module), and can only maintain a low RCS level under a certain polarization electromagnetic wave detection and in certain directions (backscattering), and when the detection signal polarization changes, it no longer has RCS reduction characteristics, and because the energy can only be scattered in a few limited directions, according to the energy conservation theory, the energy in the limited scattering direction must be relatively large, and there is still a high probability of interception and discovery, which is absolutely perfect for the dual-station or multi-station detection technology. At the same time, in order to make the distribution of electromagnetic scattering more uniform as much as possible, we often pin our hopes on complex phase optimization technology. The complex and time-consuming global optimization algorithm makes the design very complicated, inefficient and not robust

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