TEM喇叭天线辐射机理分析和优化设计  

Radiation mechanism analysis and optimized design of TEM horn antennas

作　　者：朱四桃[1] 易超龙[1] 陈昌华[1] 石一平[1] 郑磊[1] 夏文锋 谢晋[1] 

机构地区：[1]西北核技术研究所,高功率微波技术重点实验室,西安710024

出　　处：《强激光与粒子束》2013年第9期2368-2372,共5页High Power Laser and Particle Beams

摘　　要：在频域和时域研究了TEM喇叭天线的辐射机理。在频域,高频信号激励的TEM喇叭表现为口径天线的辐射特性,具有良好的方向性;低频信号激励的TEM喇叭可视作偶极子天线,具有全向辐射特性;在时域,脉冲激励的TEM喇叭天线辐射场由四个子波叠加构成,在不同方向上,各个子波的波形和相对时序不同,导致不同方向上辐射场波形也不相同。根据辐射机理研究结果,提出了一种TEM喇叭天线末端加载设计并给出了其优化设计方法,有效地改善了天线主轴辐射性能,提高了辐射因子和天线效率。The radiation mechanism of a TEM horn antenna both in time and frequency domain is researched.The TEM horn fed by the high-frequency signal behaves as an aperture antenna with favorable directional radiation capability and the TEM horn fed by the low-frequency signal behaves as a dipole antenna with omnidirectional radiation field.In time domain,the radiation field of TEM-horn antenna fed by a short impulse consists of four sub-waves.The waveform and comparative time sequence of every sub-wave is different in every direction,and that leads to dissimilar radiation waveform to every direction of antenna.Based on the research result,we propose an end-loading optimizing method for TEM-horn-antenna design.In this way,the radiation performance on boresight and the efficiency of the TEM horn are observably improved.

关 键 词：TEM喇叭 天线 机理 优化设计 辐射因子 

分 类 号：TN788[电子电信—电路与系统]