Metasurface based four-beam vortex field Cassegrain lens antenna

Abstract

The invention provides a metasurface based four-beam vortex field Cassegrain lens antenna, and is used for solving the technical problem of small coverage area of a vortex field in the prior art. Theantenna includes a lens, a feed source, a reflecting surface and a support structure. The lens is of a central hollow structure, and includes K first medium plates which are stacked in order. A firstpatch array consisting of uniformly arranged metal patches is printed on the surfaces, facing the reflecting surface, of the first medium plates of the odd-numbered layers and the surfaces, facing away from the reflecting surface, of the first medium plate of the last even-numbered layer. A second patch array consisting of uniformly arranged regular cross-shaped metal patches is printed on the surfaces, facing the reflecting surface, of the first medium plates of the even-numbered layers. The reflecting surface includes a second medium plate. Uniformly arranged metal ring patches are printed on one side of the reflecting surface, and metal floor is printed on the other side. The reflecting surface is fixed to one side of a lens focus through the support structure. Four vortex fields of different directions are obtained by dividing the first patch array into multiple rectangular regions with an additional phase difference of 180 degrees between adjacent rectangular regions.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to a vortex field metasurface lens antenna, in particular to a metasurface-based four-beam vortex field Cassegrain lens antenna, which can be used in the fields of communication and radar. technical background [0002] The vortex field is an electromagnetic wave beam carrying a helical isophase plane. Due to its good orthogonality, vortex electromagnetic waves can form a large number of same-frequency multiplexing channels, which greatly improves spectrum utilization and communication capacity. [0003] At present, the generation of vortex electromagnetic waves is mainly realized by two devices: array antenna and helical phase plate. Among them, the array antenna arranges the radiating elements in a circle, and each radiating element is externally connected to a different feeding network. By controlling the feeding network to change the initial phase of the radiating element, a sing...

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Problems solved by technology

For example, application publication number CN103036065A, a patent application titled "A Cassegrain-type metamaterial antenna", discloses a Cassegrain-type metamaterial antenna, including a feed source, a reflective element arranged in front of the feed source and The converging metamaterial board is set behind the feed source, and a core layer is added to the converging metamaterial board. By changing the shape of the core layer, the beam convergence is realized. This invention reduces the length of the feeder line, but it cannot generate a vortex field and can only generate a single beam , cannot adapt to the communication field with high beam coverage requirements

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