Broadband low-sidelobe luneberg lens antenna based on gradient refractive index metamaterial

Abstract

The invention provides a broadband low-sidelobe luneberg lens antenna based on a gradient refractive index metamaterial, and mainly solves the problems of high processing cost and low accuracy of an existing luneberg lens and the problems of low gain and poor beam scanning effect of a planar lens antenna. The broadband low-sidelobe luneberg lens antenna comprises a metamaterial lens (1) and a feedsource (2), and the feed source is placed on the outer surface of the metamaterial lens. The metamaterial lens is composed of N photonic crystal cells (12) with different effective dielectric constants, wherein the crystal cells are periodically arranged into a sphere in space by taking a lattice constant a as a period, each crystal cell is composed of dielectric cylinders (121) of a diamond structure or a wood block stacking structure, the dielectric cylinders of the adjacent crystal cells are connected with each other, and the dielectric cylinders of the crystal cells are different in radius so as to achieve a required equivalent dielectric constant. The antenna is wide in frequency band, high in gain, low in side lobe, low in cost, convenient to process and manufacture, capable of achieving 360-degree beam scanning and capable of being used for satellite communication, automobile anti-collision radar and microwave remote sensing.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a wide-band low-sidelobe Luneburg lens antenna, which can be used for satellite communication, automobile anti-collision radar and microwave remote sensing. Background technique [0002] A Luneberg lens is a spherical shape made of several layers of materials with decreasing refractive index from the inside to the outside, which can transmit and receive electromagnetic waves. Lunberg lens antenna consists of lens and feed source, which has the characteristics of wide frequency band, high gain and multi-beam, and can be used as wide-angle scanning antenna. [0003] A traditional Lunberg lens is achieved by dividing it into a finite number of concentric shells, superimposing thin layers of different thicknesses starting from the middle, each thin layer fabricated using a homogeneous material with a different dielectric constant, and then assembling all the shells in a ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a wide-band low-side lobe Lunberg lens antenna based on gradient refractive index metamaterials, to solve the problems of high technical difficulty, high cost, time-consuming, and low accuracy in traditional methods, and to solve the problem of low accuracy based on metamaterials. The two-dimensional Lunberg lens gain, efficiency, and electromagnetic response to waves from different directions are not good.

Images