宽带太赫兹偶极天线及阵列研究  

Research on Broadband Terahertz Dipole Antenna and Array

作　　者：刘永方 张永平 Liu Yongfang;Zhang Yongping(College of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China;Innovation Laboratory of Terahertz Biophysics,National Innovation Institute of Defense Technology,Beijing 100071,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]国防科技创新研究院太赫兹生物物理创新试验室,北京100071

出　　处：《应用激光》2021年第3期599-607,共9页Applied Laser

摘　　要：针对单个偶极天线辐射功率低的问题,设计了透镜天线和光电导天线阵列来提高天线的辐射性能。首先,设计了半径为0.5、1.0和1.5 mm的透镜天线,研究了透镜的半径和扩展长度对天线辐射性能的影响。结果表明,当扩展长度与半径比值为0.28时,透镜天线的方向性更好,0.5 mm的透镜天线的峰值增益达到26.1 dB。进一步,设计了2×2光电导天线阵列。通过试验测得阵元的辐射功率约为10μW,并且阵元的信噪比约为50 dB。试验结果表明太赫兹信号的合成效率接近90%,提高了太赫兹输出功率,从而为设计制作包含更多阵元的小型化天线阵列提供基础。同时,对影响光电导探测天线的噪声因素进行了探讨。For the limited power capacity of single dipole antenna, the lens antenna and photoconductive antenna array were designed to improve the radiation performance. At first, the lens antennas with radius of 0.5 mm, 1.0 mm and 1.5 mm were designed, and the influence of the radius and extension length of the lens on the antenna performance was studied. The results indicated that when the ratio of extension length to radius was 0.28, the directivity of the lens antenna was better, and the peak gain of the 0.5 mm lens antenna reached 26.1 dB. Further, a 2×2 photoconductive antenna array was designed. The radiated power of the array element was about 10 μW, and the signal-to-noise ratio of the array element was about 50 dB. The experimental results showed that experimental results show that the combination efficiency of terahertz signals was close to 90%, which improved the output power of terahertz. It provided basis for the design and manufacture of miniaturized antenna arrays with more array elements. The factor affecting the noise generated by the terahertz photoconductive antenna was also studied.

关 键 词：太赫兹 透镜天线 天线阵列 光电导天线噪声 

分 类 号：TN821.4[电子电信—信息与通信工程]