Design of the New Wideband Vivaldi Feed for the HERA Radio-Telescope Phase II
Design of the New Wideband Vivaldi Feed for the HERA Radio-Telescope Phase II
复制标题
DOI：
10.1109/tap.2021.3083788
复制
发表时间：
2020-09
影响因子：
5.7
通讯作者：
N. Fagnoni;E. de Lera Acedo;N. Drought;D. DeBoer;D. Riley;N. Razavi-Ghods;S. Carey;A. Parsons
中科院分区：
文献类型：
--
作者：
N. Fagnoni;E. de Lera Acedo;N. Drought;D. DeBoer;D. Riley;N. Razavi-Ghods;S. Carey;A. Parsons
本文介绍了一种新的双极化Vivaldi馈源的设计，用于氢时代再电离阵列（HERA）射电望远镜。这种宽带馈电已被开发用于取代第一阶段偶极馈电，并用于照亮直径为14米的碟形天线。它旨在提高HERA的科学能力，使其能够表征来自宇宙黎明以及再电离时代的红移21厘米氢信号。这是通过将带宽从100-200 MHz增加到50-250 MHz，优化天线-接收器系统的时间响应并提高其灵敏度来实现的。这种新的Vivaldi馈源直接由放置在圆形空腔内的差分前端模块馈电，并通过锥形槽中间的电缆连接到后端。我们表明，这种特殊的配置对辐射模式和系统响应的影响最小。
This article presents the design of a new dual-polarized 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 characterize 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 to 50–250 MHz, optimizing 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 that pass in the middle of the tapered slot. We show that this particular configuration has minimal effects on the radiation pattern and the system response.