论文标题
HERA Radio-TeleScope II期的新宽带Vivaldi Feed的设计
Design of the New Wideband Vivaldi Feed for the HERA Radio-Telescope Phase II
论文作者
论文摘要
本文介绍了针对电离阵列（HERA）无线电镜的新的双极化Vivaldi饲料的设计。该宽带进料是为了替代I期偶极子进料的开发，用于照亮直径14米的盘子。它旨在通过允许从宇宙黎明以及电离时代表征红移的21 cm氢信号来提高HERA的科学能力。这是通过将带宽从100-200 MHz增加到50-250 MHz来实现的，从而优化了天线接收器系统的时间响应并提高其灵敏度。这种新的Vivaldi进料直接由放置在圆形腔内的差分前端模块，并通过锥形插槽中间的电缆连接到后端。我们表明，这种特定的配置对辐射模式和系统响应的影响很小。
This paper presents the design of a new dual-polarised Vivaldi feed for the Hydrogen Epoch of Reionization Array (HERA) radio-telescope. This wideband feed has been developed to replace the Phase I dipole feed, and is used to illuminate a 14-m diameter dish. It aims to improve the science capabilities of HERA, by allowing it to characterise the redshifted 21-cm hydrogen signal from the Cosmic Dawn as well as from the Epoch of Reionization. This is achieved by increasing the bandwidth from 100 -- 200 MHz to 50 -- 250 MHz, optimising the time response of the antenna - receiver system, and improving its sensitivity. This new Vivaldi feed is directly fed by a differential front-end module placed inside the circular cavity and connected to the back-end via cables which pass in the middle of the tapered slot. We show that this particular configuration has minimal effects on the radiation pattern and on the system response.
