基于石墨烯材料的太赫兹波段波束可重构反射阵列天线设计

Design of Terahertz Beam Reconfigurable Reflector Array Antenna Based on Graphene Material

针对太赫兹通信,结合石墨烯材料在太赫兹波段下相较于金属具有利于阻抗匹配、电可控特性的独特优势与可重构反射阵列天线高辐射效率等优点,设计了一款适用于太赫兹波段基于石墨烯材料的波束可重构反射阵列天线。在天线移相单元辐射贴片缝隙嵌入石墨烯贴片,软件仿真中调节石墨烯贴片的化学势可改变其表面电阻值,达到动态调节天线单元补偿相位的目的。仿真结果表明,当中心频率为3.6976 THz时,移相单元在0.1、4.0 eV时具有180°的相位差,在0.1~4.0 eV内调节石墨烯贴片的化学势时,化学势与天线单元相位成正比。并设计了一款4×4的阵列天线,仿真结果表明,该阵列天线可实现(-30°,+30°)范围的波束扫描,且最大增益可达20.9 dBi。研究结果可为太赫兹波段反射阵列天线的研究及石墨烯材料在可重构通信器件中的应用提供新的思路。

For terahertz communication,a beam reconfigurable reflector array antenna based on graphene material is designed,combining the unique advantages of impedance matching and electrical controllability of graphene material compared with metal in terahertz band and the advantages of high radiation efficiency of reconfigurable reflector array antenna.The graphene patch is embedded in the gap of the antenna phaseshifting unit radiation patch,and the surface resistance value can be changed by adjusting the chemical potential of the graphene patch in the software simulation to realize the purpose of dynamically adjusting the antenna unit compensation phase.The simulation results show that when the center frequency is 3.6976 THz,the phase shifter unit has a phase difference of 180°at 0.1 and 4.0 eV.When the chemical potential of the graphene patch is adjusted within 0.1‒4.0 eV,the chemical potential is proportional to the phase of the antenna unit.A 4×4 array antenna is designed,and the simulation results show that the array antenna can achieve beam scanning in the range of(−30°,+30°),and the maximum gain is 20.9 dBi.This paper provides a new idea for the study of terahertz reflector array antenna and the application of graphene materials in reconfigurable communication devices.