大口径天线微波短脉冲辐射特性的数值分析  

Numerical Studies on Radiation Characteristics of Large-Aperture Antennas Excited by Short Microwave Pulses

作　　者：邢笑月 黄文华[1,2] 刘小龙[1,2] 汪海波[1,2] 

机构地区：[1]西北核技术研究所,西安710024 [2]高功率微波技术重点实验室,西安710024

出　　处：《现代应用物理》2016年第1期41-45,共5页Modern Applied Physics

摘　　要：为使大口径天线能够正常辐射几十纳秒甚至几纳秒的微波脉冲,通过数值计算,获得了大口径天线主轴方向不同距离及偏离主轴不同角度处,辐射场波形脉冲宽度及电场强度幅值随微波激励脉冲宽度的变化关系;同时,还获得了不同口径尺寸天线辐射场波形脉冲宽度及电场强度幅值随偏离主轴不同角度的变化关系。结果表明:在口径天线远场条件下,天线主轴方向的辐射场波形无畸变;偏离主轴,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,激励脉冲宽度越小,畸变越严重;在10dB波束宽度范围内,不同尺寸口径天线的辐射场波形不变。In order to meet the needs for large aperture antennas to normally radiate dozens of nanoseconds or even a few nanoseconds microwave pulses,we calculated the relations between pulse width and amplitude of the radiation field at different positions on the principal axis for different angles deviated from the principal axis,and obtained the relations between pulse width and amplitude of the radiation field,and exciting microwave pulse width for different aperture sizes.The results indicates that the distances on the principal axis has no significant influence on the antenna radiation field waveform;the antenna radiation field waveforms would exhibite pulse widening and amplitude decreasing for larger deviation angle;in the domain of 10 dB beamwidth,the antenna radiation field waveform remains unchanged for different aperture sizes.

关 键 词：大口径天线 微波短脉冲 微波激励脉冲宽度 辐射场波形 

分 类 号：TN827.5[电子电信—信息与通信工程]