Deformation luneberg lens based on novel metamaterials

Abstract

The invention discloses a deformation luneberg lens based on novel metamaterials. The lens is formed by the way that fifteen layers of round dielectric sheets are arrayed in the radial direction in an equally-spaced mode, and I-shaped metal structure units are periodically distributed on each layer; the sizes of I-shaped structures which are attached to the sheets far away from the center of the lens are smaller and smaller, and the equivalent dielectric constants are smaller; the equivalent dielectric constant of the outermost layer is one approximately, the equivalent magnetic conductivity is also one approximately, and thus the air layer attaching purpose is achieved. Compared with a traditional luneberg lens, the deformation luneberg lens is changed in that the position of a feed source is varied, and a round rail is arranged in the deformation luneberg lens to allow the feed source to move. A cylindrical wave generated by the feed source is emergent in the mode of a plane wave under the action of the lens, the emergent direction of the plane wave is changed along with the movement of the feed source on the rail, and thus wide-angle scanning of beams is achieved. The deformation luneberg lens based on novel metamaterials is simple in design and manufacture and capable of converting the cylindrical wave into the plane wave, thereby having a wide application prospect in the fields of radar, antennas and the like.

Description

technical field [0001] The invention relates to a deformed Luneberg lens used in the microwave frequency band, which belongs to the field of lens antennas and novel artificial electromagnetic materials. Background technique [0002] The novel artificial electromagnetic material (Metamaterials) in the present invention is an emerging research field in electromagnetism, and its basis is the equivalent medium theory, which consists of a series of designed structural units arranged according to certain rules on the sub-wavelength scale. By carefully designing the cell structure and size, the required equivalent permittivity and permeability can be obtained. After recent years of development, new artificial electromagnetic materials have been greatly developed, and have been widely used in stealth and antenna engineering. The Lunberg lens based on new artificial electromagnetic materials uses the convenient and controllable realization of the equivalent dielectric constant of th...

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Problems solved by technology

However, the feed source of this Lunberg lens must be placed outside or on the edge of the lens, which is not conducive to the centralized design of devices in engineering applications

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