A Mode Transformation Method for Low RCS Metasurfaces Based on Eigenmode Theory

Abstract

The invention belongs to the field of electromagnetic technology, and relates to a low radar cross section, in particular to a mode conversion method of a low-RCS meta-surface based on the characteristic mode theory. The mode conversion method is characterized by at least comprising the following steps: S1, calculating the characteristic mode curve of one meta-surface sub-unit (3) under fixed electromagnetic wave incidence conditions; S2, carrying out 4*4 array arrangement according to the meta-surface sub-units (3) obtained in S1; and S3, symmetrically arranging a meta-surface sub-array (4) obtained in S2 and a rotating sub-array thereof to form a meta-surface array (5) with an RCS reduction effect. The invention presents a mode conversion method of a low-RCS meta-surface based on the characteristic mode theory, which can design a low-RCS meta-surface array according to the design process without relying on the experience of designers, so as to greatly accelerate the design process and shorten the design cycle. By using the method, a low-RCS meta-surface structure can be designed more intuitively, concisely and efficiently.

Description

technical field [0001] The invention belongs to the field of electromagnetic technology, and relates to a low radar scattering cross section, in particular to a mode conversion method of a low RCS metasurface based on eigenmode theory. Background technique [0002] Radar cross section (RCS) is an important physical quantity to measure the scattering ability of a scatterer. It can quantitatively characterize the ability of a target object to scatter electromagnetic wave energy in a fixed direction under the incident electromagnetic wave. It is an important parameter to measure the scattering intensity of a target. Radar cross section The smaller it is, the better the concealment performance of the target. At present, the technologies for reducing target radar cross-section generally include three types: loading radar absorbing material technology, shape optimization technology, and active or passive cancellation technology. Radar absorbing materials can convert electromagnet...

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Problems solved by technology

However, the problem with this method is that it is difficult to intuitively connect the reflection phase with the metasurface structure during the design process of the metasurface subunit, and cannot clearly reflect the working mechanism of the metasurface structure, so the design process relies more on Due to the designer's experience, it is necessary to design a metasurface subunit that meets the requirements through continuous trials, resulting in a substantial increase in the time cost of the entire design process

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