TEM喇叭天线末端加载设计及实验  

Design and Experiment of End Loading on TEM Horn Antenna

作　　者：朱四桃[1] 易超龙[1] 朱郁丰[1] 陈昌华[1] 石一平[1] 郑磊[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：《现代应用物理》2013年第4期343-348,共6页Modern Applied Physics

摘　　要：通过对TEM喇叭天线辐射机理的研究,指出了脉冲激励的TEM喇叭天线辐射场由4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。由于天线末端辐射子波和馈电点辐射子波极性相反,在主轴方向上两者相互抵消,引起天线主轴辐射性能退化。针对这一问题,提出了一种TEM喇叭天线末端加载设计方法,可改变天线末端辐射子波极性,使其与馈电点辐射子波同相叠加。数值模拟和实验结果表明,该设计方法提高了TEM喇叭天线主轴辐射因子rEp值和rEp-p值,并改善了天线的低频辐射性能。Abstract This paper mainly focused on the radiation mechanism of TEM horn antenna, and indicated that the TEM-horn-radiation field consisted of four wavelets. Each wavelet has dif- ferent waveforms and relative time sequences, which led to different radiating waveform in different directions. Since the wavelet radiated from the end of the antenna had opposite po- larity with that radiated from the feed point, these two wavelets counteracted each other on the boresight. As a result, the radiation field on the boresight degenerated. To solve this problem, a design for end-loading on TEM horn antenna was presented, which would change the polarity of wavelets radiated from the end of the horn antenna, and made it with the oth- er wavelet radiated from the feed point in the same phase. The simulation and experiment re- sults show that this design increased the rEp and reap of TEM horn antenna, and also im- proved the antenna＇s low frequency radiation properties.

关 键 词：TEM喇叭 辐射 加载设计 辐射因子 

分 类 号：TN788[电子电信—电路与系统]