High sensitivity feed systems for the Square Kilometer Array Dish
High sensitivity feed systems for the Square Kilometer Array Dish
复制标题
用于平方公里阵列皿的高灵敏度馈电系统
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Lei Xie
中科院分区：
文献类型：
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作者：
B. Du;Jin Wang;Zeyu Meng;Lei Xie
本文对平方千米阵列(SKA)作了简要介绍。本文介绍了SKA菜肴4、5A、5B三种宽带馈电系统的设计。这些馈电系统主要由宽带正交模换能器(OMT)和喇叭组成。提出了一种紧凑型宽带OMTs和喇叭的设计方法。在此基础上，设计了4波段、5A波段和5B波段的馈电系统。已经开发并测试了三个样机。在整个工作频率范围内，测量结果与计算结果吻合很好。文中还给出了采用馈电系统的整形格里高利偏置双反射面天线系统的灵敏度计算结果，显示了良好的性能。经验证，所设计的进料系统能够满足SKA菜肴的要求。
In this paper, a brief description of the Square Kilometer Array (SKA) is given. We present the design of three wideband feed systems for the Band 4, 5A and 5B for the SKA dish. These feed systems mainly consist of a wideband orthomode transducer (OMT) and a horn. A methodology for design of the compact wideband OMTs and horns is presented. Based on this method, the Band 4, 5A and 5B feed systems are designed. Three prototypes have been developed and tested. The measured results agree very well with the calculated ones across the operating frequency range. Also, the calculated sensitivity of a shaped Gregorian offset dual-reflector antenna system with the feed system is given, which shows good performance. It is confirmed that the designed feed systems can be satisfied with the requirements of the SKA dish.