五百米口径球面射电望远镜的相控阵馈源设计

相控阵天线作为射电望远镜的馈源时可以扩大射电望远镜的视场, 提高天空扫描速度和系统灵敏度.分析了相控阵馈源的阵列排布形式、阵列规模、阵元间距等参数对灵敏度的影响, 并给出了设计一般相控阵馈源的基本方法.针对五百米口径球面射电望远镜(Five-hundred-meter Aperture Spherical Telescope, FAST)的系统要求设计了一种工作在L波段的宽带双极化微带偶极子相控阵馈源.相控阵系统采用制冷放大器时所设计的馈源满足FAST系统性能指标.加工并测试了单个阵元的结果, 与采用HFSS软件仿真的结果相当吻合, 验证了所设计馈源的可行性.

Design of phased array feed for five-hundred-meter aperture spherical telescope

Using phased array as the feed of a radio telescope can effectively expand the field of view of radio telescope, and improve the scanning speed and system sensitivity.After analyzing the impact of the parameters of phased array feed including array configuration, array size, element spacing and other factors on the radio telescope of sensitivity, we gave a basic method to design general phased array feed.We designed a microstrip dipole phased array feed(PAF) based on the system requirements of Five-hundred-meter Aperture Spherical Radio Telescope(FAST).The PAF with broadband and dual polarized microstrip dipole operates in the L band and is implemented using cryo low noise amplifier(LNA) matches to fit the FAST system.The tested results of a single machined element show good correlation with the HFSS model simulation results, which verifies the feasibility of the designed PAF.