喇叭有效口径渐变法测量高功率微波天线近场气体击穿
High power microwave air breakdown by changing effective aperture of horn antenna
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摘要: 设计了喇叭有效口径渐变法测量高功率微波气体击穿的实验方案，通过连续改变喇叭的有效口径改变天线近场的电场强度，使微波传输达到气体击穿的条件。介绍了实验原理及诊断方法，进行了L波段的高功率微波天线近场空气击穿实验，分析了实验中得到的典型波形。结果显示:脉宽30 ns、L波段的微波在0.4×105 Pa空气中击穿阈值为33.9 kV/cm。实验现象与设计吻合，验证了该方案研究微波气体击穿的可行性。Abstract: The paper presents a method to get high power microwave gas breakdown by changing the effective aperture of horn antenna. Changing the effective aperture can adjust the electric field near the inner dielectric window, lending to air breakdown. The principle of this method is introduced. In addition, the verification experiment has been carried out for L band microwave with pulse duration being 30 ns, and the experimental waveforms are analyzed. The breakdown threshold of 0.40×105 Pa air was measured to be 33.9 kV/cm. The experimental results agree well with the design, and the method is proved to be effective to study high power microwave gas breakdown.
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Key words:
- high power microwave /
- air breakdown /
- antenna /
- effective aperture /
- threshold
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