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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1.575GHz时,增益为22.7dBi,天线口径效率为98.3%,反射系数为-25dB,带宽达到5%,带宽内天线增益波动小于等于0.4dB、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1.92GW。
A high power RF microwave radiation system based on wide-edge longitudinal slit standing wave array is designed. The system consists of four rectangular waveguides and Teflon antenna window. The antenna adopts vacuum insulation to realize the high power capacity of the antenna. The vacuum side of the antenna window adopts the periodic groove technology to restrain the breakdown of the high-power microwave dielectric surface. Designing a support plate between the waveguide slot array and the antenna window suppresses the surface wave current in addition to supporting the antenna window. The radiation system was optimized by HFSS numerical simulation software. The numerical simulation results show that the designed radiation system has a gain of 22.7dBi at 1.575GHz, an antenna aperture efficiency of 98.3%, a reflection coefficient of -25dB, a bandwidth of 5% and an antenna gain fluctuation of less than or equal to 0.4dB within the bandwidth. Antenna The caliber efficiency is greater than or equal to 98%, the main lobe pointing deviation is less than or equal to 1.2 °. System power capacity reached 1.92GW.