高功率超宽谱双反射面天线优化设计与实验

Optimization and experiment of HPM UWB dual-reflector antenna

对高功率超宽谱双反射面天线系统进行了优化改进设计,兼顾辐射性能、馈入反射和功率容量。采用沿能流线设计的"粗胖"实体结构代替板状TEM喇叭极板结构,增加低频电流的回流通道,从而改善天线馈入反射特性。将副反射面设计为尼龙箱体内、外两部分,使其与尼龙箱体之间的连接螺钉不再突出于高压电场中,优化后最大场强下降了约70%,功率容量达到59GW,通过Taguchi优化算法对组合馈源喇叭结构进行整体优化,天线辐射因子rE(辐射场峰值与观测点距离乘积)提高了1.2倍。优化后的天线系统进行了高功率实验,实验结果表明:天线系统功率容量达到30GW,辐射因子超过8MV。

The HPM UWB dual-reflector antenna has been optimized by Taguchi＇s method, and simulated by FEKO software. The radiation efficiency, reflectance and high voltage insulation have been considered. The antenna reflectance was decreased by increasing the thickness of TEM horn plates. The simulation result shows that the VSWR of combined feeding horn at 800 MHz-1.25 GHz decreases from 3.5 to no more than 1.5. The electric field of screws which connect the sub-reflector and insulation nylon box is decreased by 70 by optimizing the structure of sub-reflector and insulation box. The antenna can be fed with 81 GW UWB pulse without high power breakdown. The radiation field-range product has been improved by 1.2 times. The ratio of the radiation field-range product and source voltage reaches 11. The high power antenna experiments have been conducted. The experiment results verified that the high power capacitance of antenna is more than 30 GW,the field-range product exceeds 8 MV, the spectrum of radiation is from 182 MHz to 1.69 GHz, and the 3 dB widths of power of H- and E-plane of radiation are 2.35 and 2.27 respectively.