“祝融号”火星车反射面天线设计

Design of a reflector antenna for Zhu-Rong Mars rover

针对“天问一号”火星探测器“祝融号”火星车的探测通信任务需求,提出了一种X频段轻小型宽频圆极化反射面天线。该反射面天线采用了新型一体化紧凑馈源技术,实现馈源长度和口径减小20%的同时提高了反射面天线的口径效率,抵挡了火星的尘埃影响。经过对馈源进行的仿真优化,最终实测结果表明,该天线在7.1~8.4 GHz内口径效率可达62.3%,在深空探测的工作频带范围内具有较好的增益、驻波和圆极化特性,该天线已成功应用于“天问一号”火星探测器“祝融号”火星车。

Considering the requirement of TianWen-1 Zhu-Rong Mars rover′s communication,an X band compact broadband circular polarization reflector antenna was introduced.The novel integrated compact feed technology with length and aperture reduced by 20%was adopted in this reflector.This new feed technology can improve the aperture efficiency of the reflector antenna,and resist the impact of Martian dust.The X-band reflector was optimized,fabricated,and measured.The measured results show that the antenna can reach 62.3%aperture efficiency from 7.1 GHz to 8.4 GHz frequency band as well as obtain better performance in terms of the gain,the VSWR(voltage standing wave ratio),and the circular polarization in the operating frequency band of the deep space exploration.This novel reflector antenna has been successfully applied to Zhu-Rong Mars rover.