大口径天线短脉冲微波辐射特性  

Microwave radiation characteristics of large-aperture antenna excited by short pulses

作　　者：邢笑月 黄文华[1] 刘小龙[1] 汪海波[1] 李治国[1] 童清波 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《强激光与粒子束》2016年第9期91-94,共4页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目

摘　　要：为了开展大口径天线短脉冲微波辐射特性研究,建立了一套大口径天线微波短脉冲特性测试系统。该系统可产生快上升沿、脉冲可调(脉宽最短可到0.5ns)的微波激励脉冲、接收动态范围大于52dB。利用该测试系统进行实验,获得了不同微波激励脉冲宽度条件下,天线方向图和辐射场波形脉冲宽度变化曲线。测试结果表明:在天线远场距离处,改变微波激励脉冲宽度,对天线主轴辐射场波形基本无影响;而在偏离主轴处,辐射场波形会出现不同程度的脉冲展宽及幅值减小等波形畸变现象,偏离主轴角度越大,微波激励脉冲宽度越小,畸变越明显。A new type of test system has been designed for the research on microwave radiation characteristics of large-aperture antenna excited by short pulses.The system is made of a pulse-width tuning microwave source （the shortest pulse-width is 0.5 ns）and a receiving system whose dynamic range is up to 52 dB.Based on such test system,the changing curve of antenna pattern and the pulse-width of antenna’s radiation field waveform were obtained under the condition of different microwave pulse-width.The results show that in far field,there is no significant influence on the radiation waveform in the principal axis,by chan-ging microwave pulse-width;it was found that radiation waveforms deviated from the principal axis in different angles could pres-ent pulse widening and amplitude decreasing,the greater the angle deviated,the more obvious the phenomenon could be.

关 键 词：微波短脉冲 大口径天线 天线方向图 辐射波形 

分 类 号：O441.4[理学—电磁学]