Antenna decoupling structure and method based on metamaterial and soft surface

Abstract

The invention discloses an antenna decoupling structure and method based on a metamaterial and a soft surface. In the structure, an antenna structure is used for radiating or receiving space electromagnetic waves outwards; the top layer and the bottom layer of the metamaterial unit structure are the same split-ring resonator metal patterns, the middle layer is a medium FR4, and the structure enables the metamaterial unit structure to have negative medium parameter characteristics in a specific working frequency band and is used for inhibiting electromagnetic wave propagation between antenna structures; the band elimination characteristic is further improved by utilizing the blocking effect of the soft surface on electromagnetic waves; a metamaterial unit structure and a soft surface structure are combined and loaded between antenna structures, so that an isolation effect in a wide working frequency band is realized. According to the invention, the problem of antenna mutual coupling caused by space direct waves between antennas is solved, and the antenna can be applied to a phased-array antenna and a high-coupling MIMO (Multiple Input Multiple Output) array; the decoupling structure is simple in basic principle and clear in scheme, the designed decoupling structure is wide in working frequency band range and obvious in decoupling effect, and the decoupling structure has high application value.

Description

technical field [0001] The invention relates to the field of novel artificial electromagnetic materials, in particular to an antenna decoupling structure and method based on metamaterials and soft surfaces. Background technique [0002] Artificial electromagnetic materials refer to one-dimensional, two-dimensional or three-dimensional periodic artificial composite electromagnetic media / structures with extraordinary physical properties that conventional media in nature do not have. It has the advantages of processing and other advantages, and has a wide range of applications in the electromagnetic field. For example, artificial electromagnetic materials are used in antenna design to improve impedance matching characteristics, reduce antenna mutual coupling, increase antenna gain, and reduce antenna RCS. [0003] On the other hand, in modern communication, the requirements for the communication capacity and transmission rate of the antenna are getting higher and higher. Stro...

AI Technical Summary

Problems solved by technology

At present, there are many methods for decoupling between antenna units. The common one is to slot on the ground plane. The principle is to prevent the current between antenna units from coupling through the ground, but this method often affects the original antenna. The radiation characteristics have a great impact; there is also a method of adding a decoupling network between the feed port and the antenna to reduce the coupling between the antenna elements, but the decoupling effect of this method is not obvious, and the design of the decoupling network is more complicated; In addition, using an electromagnetic bandgap structure to improve the isolation of the antenna elements, although this method has a better decoupling effect, its working bandwidth is often very narrow

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