Design And Analysis Of Patch Antenna Based On Electromagnetic Metamaterial

In recent years,wireless communication technology has been continuously updated and iterated,and data transmission with larger capacity and higher rate has become a huge challenge faced by modern wireless communication systems.The antenna is a key component in the system,it must also meet higher requirements,for example: multi-band,miniaturization,high isolation and other design indicators.However,it is difficult to meet multiple performance requirements at the same time when designing only through traditional antenna design theory.The emergence of electromagnetic metamaterials provides new research ideas and methods for solving problems in the field of antenna design.Metamaterials are a class of artificial dielectric materials.By designing their structure and size,exotic electromagnetic properties that natural media do not possess can be obtained.On the basis of research on antenna design theory and metamaterial theory,this paper designs an antenna based on metamaterials.The specific research work is summarized as follows:(1)In order to improve the isolation between MIMO(multiple-input multipleoutput,MIMO)antenna elements,design a helical metamaterial unit structure that can generate negative permeability at 3.5GHz frequency,and then arrange the designed metamaterial unit into a 3×1 periodic structure and load it into a two-unit MIMO antenna.Compared with the original MIMO antenna without metamaterials,the MIMO antenna loaded with metamaterials improves the isolation between units by18 d B,and the decoupling effect is remarkable.At the same time,the loading of metamaterials has little effect on the operating bandwidth and radiation characteristics of the original MIMO antenna.(2)In order to increase the additional working frequency band of the single frequency antenna,an electronegative metamaterial unit structure is designed.The designed metamaterial has a negative dielectric constant near 5.5GHz,and the metamaterial unit is arranged in a 2×2 manner.By loading the metamaterial periodic structure on the ground plane side of the original single-band antenna,a new 5.5GHz high-frequency band is added to the antenna in addition to the original 3.5GHz band.Moreover,the dual-band antenna loaded with metamaterials has good impedance matching characteristics and omnidirectional radiation characteristics,and can be applied to the two frequency bands of Wi MAX 3.5GHz and 5.5GHz.