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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
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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0.5 ns)的微波激励脉冲、接收动态范围大于52 dB。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。Abstract: 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.
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