Design of a meta-ring for improving the isolation between antennas

Abstract

In today’s mobile communication, more antennas are needed in both the terminal and base station. At the same time, the size of the equipment is expected to be smaller and smaller. The small spacing between antenna elements will inevitably lead to a strong mutual coupling problem. This will seriously affect the radiation performance of the antenna, so decoupling is needed in the antenna array. The decoupling method of radiation pattern diversity can be achieved to improve the isolation characteristics between antennas by making the radiation pattern of antennas point to different directions so that there will be no intersection. Because the monopole antenna has an omnidirectional radiation directional plot. When two monopole antennas are close to each other, they will have strong coupling, so this project selects monopole antenna to study the radiation pattern diversity decoupling method. This project achieves the deflection of the radiation pattern of the monopole antenna by loading a generalized metasurface structure composed of metal rings around the monopole so that the radiation direction map of the monopole forms a conical beam and produces a null in the horizontal direction. Thus achieving the goal of decoupling the monopole antenna array. The decoupling structure is simple and easy to implement, with relatively good performance.