Research And Design Of Metamaterial Planar Array Antenna

After human has entered the information age,wireless communication has become the main way of information exchange.Therefore,wireless communication systems must meet the requirements of human for special regions and special natural environments.At the same time,due to the existence of electromagnetic waves in many other communication systems in natural space.Therefore,wireless communication systems will also face various spatial electromagnetic interference.The antenna acts as a device for exchanging the current energy of the communication system and the space electromagnetic wave energy,so the design of the antenna will be the key part of the entire radio communication system design.For an ideal array antenna,people usually do not need to consider the interaction between the antennas.However,in actual engineering design,when the spacing between the antennas is reduced to a certain distance,the mutual coupling between the antenna elements will become a serious factors that must be considered for the antenna design.In this paper,the mutual coupling mechanism between array antenna elements in a limited space is analyzed.Second,we explored the ways to improve the performance of antenna array,where the performance of the antenna includes the coupling between the antenna elements and the gain of the antenna.Then,the characteristics of the metamaterial and its application in the antenna array are analyzed in detail,and the corresponding metamaterial is designed according to the intended target of the array antenna designed.Finally,several array antennas with unique properties were designed.The specific work of this paper is divided into as following sections:The first part of this paper analyzes and studies the principle of microstrip antennas,MIMO technology,metamaterials and the principle that metamaterials can improve the performance of array antennas.Finally,several types of metamaterials are designed and analyzed in detail and extracted.In the second part,a dual-frequency antenna array is designed by arranging metamaterials between dual-band MIMO microstrip antenna array elements according to the theory of metamaterial.And the feasibility of mutual decoupling between array antenna elements with metamaterials is verified by HFSS simulation and physical testing.In the third part,according to the theory of metamaterial research and combining the characteristics of band-pass function,a meta-material frequency selection surface is designed.Finally,the meta-surface composed of the meta-material frequency selection surface unit is coating on the original MIMO array antenna.This allows the meta-surface to reduce the mutual coupling between array antenna elements and that can also enhancing the gain of the array antenna.In the last part,according to the deficiencies of the MIMO array antenna with reduced coupling between antenna array elements designed in the previous section,a frequency selective surface with metamaterial characteristics is utilized to design a mutual coupling reduced antenna array that can be applied to large scale antenna array for mobile communication base station antenna.A large reduction of the distance between the array antennas is achieved,and more array antenna unit can be deployed in a smaller plane.