晴空环境下的地基面天线多场耦合分析及试验

Multi-Field Coupling Analysis and Experiments of Ground Reflector Antennas under Clear-Day Solar Radiation

大口径高频段的地基面天线在晴空环境下的热变形对电性能影响明显。针对这一问题,首先建立晴空环境的温度场分析模型,利用ANSYS软件分析得到面天线温度场并计算结构变形;其次利用某7.3m卡式天线设计了温度试验,结果表明温度场分析模型是有效的;再次根据天线远区的电场公式计算电性能,结合温度场和结构位移场的公式建立了地基面天线的多场耦合模型;最后将该耦合模型应用于实际工程的某40m地基面天线,得到的分析结果有实际指导意义。

Thermal-structural deformation caused by clear-day solar radiation will effect the electrical parameters of ground reflector antennas. For this problem,temperature field analysis model is proposed firstly. The temperature and the structure deformation of antenna could be obtained with ANSYS software. Secondly,a temperature experiment has been designed via a 7.3 m reflector antenna. Results of the experiment indicate that,the temperature model is valid. Thirdly,electrical parameters of antenna are calculated by far field patterns formula. With other two formulas of temperature field and structure,the multi-field coupling model of ground reflector antennas is proposed. The model proposed in this paper is applied to a 40 m reflect antenna and the result is meaningful for practical engineering.