Graphene-based Terahertz Band Reconfigurable Antenna Design And Research

In the new generation of 6G communications,the communication frequency band has been moved to the terahertz band,compared with microwave communication,terahertz communication has the advantages of fast transmission speed,large capacity,narrow beam,good directionality and so on.In addition,in order to pursue the miniaturization of next-generation communication equipment,antenna components are required to achieve more communication functions in a smaller space,and multi-band,multi-polarization and multi-functional design are required.Therefore,the reconfigurable antenna has received widespread attention in the communication system,and this paper uses the excellent electrically controllable characteristics of graphene in the terahertz band to study the reconfigurable antenna,as follows:(1)The conductivity model,dielectric constant model and its calculation and simulation methods of graphene are derived,and the preparation methods and regulation methods of graphene are comprehensively summarized.(2)A gold dipole antenna is proposed,with Si/SiO2 as the dielectric layer substrate,graphene as a parasitic layer attached to the gold dipole,and the chemical potential of graphene is regulated by an bias voltage to regulate its conductivity,realizing the frequency reconfigurable function,with a tuning span of 31.4GHz,and the antenna has good return loss,relative bandwidth and directivity coefficient.(3)A multi-mode reconfigurable antenna in the terahertz band with microstrip patch as the template is proposed,the innovative floor slotting treatment is used,the impedance matching method is used for 1/4 impedance change segment feeding,and the graphene is divided into three groups distributed in the slotted slot on the back of the antenna,and by regulating the chemical potential of graphene,the switching and fine-tuning modes of graphene can realize the reconfigurable function of the antenna to varying degrees.In switch mode,the tuning span is 1.913THz,and each frequency band has high sensitivity,high isolation,and other radiation performance is excellent,which can complete large-scale tuning functions.In the fine-tuning mode,only one set of graphene chemical potential is changed,the tuning span is 1.148THz,the directionality of each mode has not changed much,other radiation performance is excellent,and the regulation of some graphene is verified by the fine-tuning mode,and the tuning function of the antenna can be realized in a small range.(4)A graphene-based terahertz band multi-parameter reconfigurable antenna is proposed,three groups of graphene materials are set as the parasitic layer of Yagi antenna,external bias voltage regulates the chemical potential of graphene materials,and the reconfigurable function of the two-directionality is realized by changing the chemical potential of graphene 2 and 3 pairs;by changing the chemical potential of graphene 1 group pair,the antenna can achieve frequency modulation in the 73.7GHz range,and the maximum radiation gain reaches 5.3dBi,and the antenna can realize the reconfigurable function of the pattern at each resonance point.Results show that the graphene antenna has multi-parameter reconfigurable performance,high radiation gain and good directionality.