Terahertz Antenna Design Based On In InSb-SiO₂ Hyperbolic Metamaterial

Terahertz science and technology have very important application prospects in many fields such as biological sciences,high-sensitivity sensors,broadband communications,and airport security inspections,and have attracted strong interest from researchers.The terahertz antenna,as one of the important devices in terahertz science and technology,has also developed rapidly in recent years.Metamaterials,also called artificial electromagnetic metamaterials,can be used to design novel terahertz functional devices to achieve effective regulation of terahertz waves.Hyperbolic metamaterials and zero index metamaterials are important branches of metamaterials and have many unique properties.In this thesis,based on periodic Indium Antimonide?In Sb?and Silicon Dioxide?Si O₂?multilayer film structure metamaterials,the terahertz near-field enhanced antenna based on hyperbolic metamaterials and the terahertz far-field radiation based on near-zero refractive index metamaterials are studied.For terahertz near-field enhanced antenna,a terahertz dipole near-field enhanced antenna based on a periodic hole array hyperbolic metamaterial is designed.The hyperbolic metamaterial consists of alternating layers of In Sb and Si O₂.Compared with the traditional dipole antenna,the near field enhancement of this method can be increased by more than 3times.The greatly enhanced near field enhancement can improve the sensitivity of the terahertz detector or sensor.Simulations show that this enhancement comes from the significant enhancement of|Ex|² and|Ez|².By scanning its parameters,it is found that the hyperbolic dispersion characteristics of the antenna gap and the multilayer structure are important to achieve large near field enhancement.For terahertz far-field radiation antenna,gain is one of the basic performance parameters for measuring the far-field radiation capability of antenna.One of the major performance drawbacks of microstrip antennas is their low gain.In view of this problem,the gain of the original antenna can be effectively improved by using a zero index metamaterial as the coating of the microstrip antenna.The zero index metamaterial can be regarded as the critical value of the In Sb and Si O₂ multilayer hyperbolic metamaterial.The simulation results show that the gain of the terahertz patch antenna at the operating frequency of 1.85 THz is increased from 5.3 d B to 7.8 d B,which is an increase of 45%.By scanning its parameters,it is found that the thickness of the In Sb and Si O₂ layers,the distance between the patch antenna and the metamaterial coating,and the number of layers in the multilayer structure have an impact on the performance of the designed terahertz patch antenna.The results in this thesis provide new ideas for the design of new terahertz antennas and have reference significance for promoting the development of terahertz technology.