High isolation Beidou array antenna based on electromagnetic meta-material

Abstract

The invention discloses a high isolation Beidou array antenna based on an electromagnetic meta-material. The antenna includes four circularly polarized unit antennas and an electromagnetic meta-material isolation structure interposed among the unit antennas, wherein the four circularly polarized unit antennas and the electromagnetic metamaterial isolation structure are printed on the same dielectric substrate, each unit antenna includes a square patch and circular patches of different radii loaded at four corners, the electromagnetic meta-material isolation structure is composed of a metal microstrip, a medium, a metal through hole and a metal ground, the metal through hole passes through the dielectric substrate, and the metal microstrip is connected with the metal ground. The antenna isadvantaged in that the operating frequency band is 1256-1281MHz and completely covers a Beidou B3 frequency band; as the electromagnetic meta-material isolation structure has equivalent negative magnetic permeability, surface wave coupling among the unit antennas can be effectively suppressed, and thereby the array antenna has high isolation in the Beidou B3 frequency band.

Description

technical field [0001] The invention belongs to the technical field of antennas and electromagnetic metamaterials, and relates to a high-isolation Beidou array antenna based on electromagnetic metamaterials. Background technique [0002] As far as the current satellite navigation system is concerned, it can provide users with all-weather three-dimensional coordinates, speed and time information at any place on the earth's surface or in near-earth space. Transportation, etc., have provided great convenience for human production and life, and brought huge economic benefits to society. However, because the landing power of satellite signals is very weak, satellite navigation receivers are extremely susceptible to interference from external signals, resulting in the receiver being unable to perform precise positioning functions. Therefore, the anti-jamming technology of satellite navigation receivers is an important part of the development of satellite navigation technology. In...

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Problems solved by technology

[0006] At present, the method of improving the isolation of the array antenna is to load the electromagnetic bandgap structure (EBG). However, due to the large size of the EBG structure itself, the array platform is large, and it has the disadvantages of difficult processing and high cost; there are also researches on etching defects. Structure (DGS), this method makes energy resonate at the defective ground structure by etching gaps on the metal ground, so it has the disadvantage of energy leakage; in addition, there is also a design method of using the feed network for decoupling, but the disadvantage lies in the design require a lot of calculations

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