设计了一种基于宽边纵缝驻波阵的高功率射频微波辐射系统, 系统由四路矩形波导以及聚四氟乙烯天线窗组成。天线内采用真空绝缘实现天线高功率容量, 天线窗真空侧采用周期刻三角槽技术抑制高功率微波介质表面击穿。在波导缝隙阵与天线窗之间设计支撑板, 除支撑天线窗外还可抑制表面波电流。采用HFSS数值模拟软件对辐射系统进行了优化设计。数值模拟结果表明, 设计的辐射系统在频率为1.575 GHz时, 增益为22.7 dBi, 天线口径效率为98.3%, 反射系数为-25 dB, 带宽达到5%, 带宽内天线增益波动小于等于0.4 dB、天线口径效率大于等于98%、主瓣指向偏差小于等于1.2°。系统功率容量达到1.92 GW。

A high power microwave antenna was developed based on longitudinal shunt slots of rectangular waveguides. The antenna consists of 4 route rectangular waveguides and a Teflon window. To obtain high power capacity, the high power microwaves inside antenna transmit in vacuum system. To restrain the high power microwave breakdown in surface of window on the vacuum side, the window surface at vacuum side is notched periodically with triangle grooves. There are support planks between waveguides and window. The support planks not only support the window but restrain the mutual coupling of the slots of neighboring waveguides. The antenna was optimized by HFSS software. The antenna works at 1.575 GHz. With a gain of 22.7 dBi and aperture efficiency of 98.3%. The active reflection coefficients of 4 route rectangular waveguides are less than -25 dB, the reflection bandwidth is 5% and the fluctuation of gain of antenna is no more than 0.4 dB over the reflection bandwidth. The aperture efficiency of antenna is no less than 98% and the deviation of direction of main lobe is no more than 1.2° over the reflection bandwidth. The high power capacity of antenna is 1.92 GW.