Ku频段相控阵馈源设计

Design of Phased Array Feed at Ku Band

摘要:

平方公里阵SKA(Square Kilometer Array)将是世界上最大的综合孔径射电望远镜,包括中国在内的多个国家正在进行先导天线、相控阵馈源、超宽带单波束馈源等关键技术的实验研究。针对SKA的关键技术之一,相控阵馈源,设计了工作在Ku频段的相控阵馈源。首先,通过对天线的焦面场进行分析,确定阵列的尺寸；接着,选择最合适的阵元形式,设计阵元并进行优化；然后,根据设计要求,以天线的灵敏度为标准,进行阵列设计,确定阵列的排布形式；再对阵元间距对灵敏度的影响进行了仿真分析,选择合适的阵元间距,使系统达到灵敏度最优。最后给出了仿真结果。

Abstract:

The Square Kilometer Array will be the largest synthesis telescope in the world. Many countries including China are involved in developing the key technologies such as reflector antenna, phased array feed (PAF) and ultra wideband single pixel feed. Aiming at the phased array feed, this paper designs a phased array feed at the Ku band. Firstly, the dimension of the array is determined by the analysis of the focal field; next, a suitable array element is selected and the design parameters are optimized; then according to the requirements, the arrangement of the array is determined, taking the sensitivity as the standard; afterwards, the effect of the array element spacing on the sensitivity is simulated, and the array elements spacing which makes the sensitivity of the system optimal is selected. Finally, the simulation results are given.