Metasurface-based convex conformal cassegrain vortex field antenna

Abstract

The invention discloses a metasurface-based convex conformal cassegrain vortex field antenna, and mainly aims to solve the problems that the existing antenna is high in phase error, low in radiation gain, and hard to realize convex vortex field antenna beam calibration. The metasurface-based convex conformal cassegrain vortex field antenna comprises a carrier (1), a main reflecting mirror (2), anauxiliary reflecting mirror (3), a feed source (4) and a supporting structure (5); the carrier adopts a convex structure; the main reflecting mirror is conformal with the carrier; each of the main reflecting mirror and the auxiliary reflecting mirror adopts a phase change metasurface structure; the main reflecting mirror is of a convex structure, wherein the main reflecting mirror comprises a maindielectric layer, a main reflecting layer and a plurality of main phase regulating and controlling layers, wherein the multiple main phase regulating and controlling layers are uniformly arranged, and are composed of main metal ring microstructures which are integrally distributed in a spiral shape and are used for generating vortex electromagnetic waves; and the supporting structure is connectedwith the main reflecting mirror and the auxiliary reflecting mirror. By virtue of the metasurface-based convex conformal cassegrain vortex field antenna, wave beam calibration of the convex cassegrain vortex field antenna can be realized, and vortex electromagnetic waves can be efficiently excited; and meanwhile, the antenna phase compensation error is lowered, the structure is simple, and the antenna can be used for communication and radar.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a Cassegrain vortex field antenna which can be used for communication and imaging. technical background [0002] In recent years, the demand for communication capacity has increased sharply, and vortex electromagnetic wave communication has become the focus of people's research because of its good orthogonality in different modes, which can form a large number of same-frequency multiplexing channels, and greatly improve spectrum utilization and communication capacity. . On the other hand, in the field of SAR imaging, in order to obtain 3D imaging with higher resolution and better signal-to-noise ratio, multiple emission sources are required to detect the same target from different angles, which significantly increases the cost and complexity of the system. The vortex electromagnetic wave itself carries continuously changing angle information, that is, a vortex field antenna can...

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Problems solved by technology

Although this kind of antenna can realize the excitation of the vortex electromagnetic field to a certain extent, it cannot be loaded on a convex surface such as a space vehicle because the main reflector is concave, and the vortex electromagnetic wave is generated by the feed source, the configuration is complicated, and the phase error is large. Big

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