Research On Polarization Reconfigurable Terahertz Antenna Based On Graphene Hybrid Structure

With the increase of communication rate,the market demand for the mature development of information technology is constantly increasing,and the high quality information transmission of communication antenna in the complex communication environment is becoming very important.The research range of high frequency terahertz antenna is also expanding,and the types of multi-parameter reconfigurable Terahertz antenna in the communication environment are also increasing.As a new research direction,the polarization reconfigurable terahertz antenna can dynamically adjust the polarization mode to improve the communication efficiency.Improve communication environment and communication quality;At the same time to achieve a variety of functions,such as communication,positioning,navigation,so as to improve the efficiency of the antenna;The production cost is reduced by simplifying the structure and reducing the number of antennas.In general,the purpose of the study of polarization reconfigurable antennas is to improve the efficiency and adaptability of antennas,so as to meet the changing communication needs.Therefore,based on graphene materials with excellent properties such as high strength,high conductivity and high toughness,we combined the graphene polarization conversion metasurface with terahertz dualfrequency antenna to build a graphene composite structure of polarized reconfigurable Terahertz antenna,and carried out detailed research and comparison.The main contents are as follows:1.Based on the graphene material and polymer TOPAS,a terahertz polarization conversion metasurface(PCM)module is designed.By adjusting the chemical potential of graphene between 0 eV and 0.5 eV,the polarization states in the 1 THz(0.76-1.02THz)and 2.5THz(2.43-2.6THz)bands can be reconstructed,showing broadband widths of 260 and 170 GHz,respectively,with a maximum bandwidth improvement of 44%over previously reported.2.The dual-frequency antenna working in 1THz and 2.5THz frequency bands is designed.The antenna has good performance such as reflection coefficient and voltage standing wave ratio,and the simulation results show that it has good directivity and gain in the Z-axis direction.3.By combining and tuning the graphene PCM array and the dualfrequency antenna module,a combined dual-frequency polarization reconfigurable terahertz antenna is designed.The antenna can switch between circular polarization and linear polarization without changing the physical structure of the antenna,and can operate at 1 THz(0.7-0.75THz),respectively.0.96-1.04THz)and 2.5THz(2.42-2.52THz).In addition,separate tests were conducted on the graphene antenna,metasurface and composite structure to verify that the components do not interfere with each other in terms of performance.