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利用电磁波射线理论对透镜天线进行了分析,基于扩展半球透镜与椭半球透镜的拟合,设计了中心工作频率为1.6THz的扩展半球透镜天线。该天线采用方形螺旋天线作为平面辐射体,利用同轴线进行馈电,增益约为15.0dBi。研究了透镜半径、扩展距离和介质材料对天线性能的影响。在扩展半球透镜天线的基础上,通过在天线上方放置扩展半球透镜、为扩展半球透镜添加匹配层对天线性能进行了改进。结果表明,改进后的透镜天线增益达到17.0dBi,与扩展半球透镜天线相比,S11参数减少了11.65dB,E面主瓣宽度降低了60°。透镜天线良好的增益特性和定向性能够很好地满足太赫兹通信系统的要求。
Based on the electromagnetic wave theory, the lens antenna was analyzed. Based on the fitting of the extended hemispherical lens with the elliptical hemispherical lens, an extended hemispherical lens antenna with a central operating frequency of 1.6 THz was designed. The antenna uses a square spiral antenna as a planar radiator, the use of coaxial feed, gain of about 15.0dBi. The effects of lens radius, extended distance and dielectric materials on the antenna performance were investigated. On the basis of extending the hemispherical lens antenna, the performance of the antenna is improved by placing an extended hemispherical lens over the antenna and adding a matching layer to the extended hemispherical lens. The results show that the gain of the improved lens antenna reaches 17.0dBi, the S11 parameter is reduced by 11.65dB and the main lobe width is reduced by 60 ° compared with the extended hemispherical lens antenna. The good gain characteristics and directivity of the lens antenna can well meet the requirements of the terahertz communication system.