A candidate active antenna design for a low frequency radio telescope array

2007 IEEE Antennas and Propagation Society International Symposium Pub Date : 2007-06-09 DOI:10.1109/APS.2007.4396541

N. Paravastu, B. Hicks, P. Ray, W. Erickson

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引用次数: 15

Abstract

The Long Wavelength Array (LWA), currently in the development stage, is a radio telescope array that will be constructed in New Mexico, USA over the next several years. It will consist of ~ 52 stations of ~ 256 cross-dipole antennas each, and will explore the Universe in the 20 - 80 MHz frequency band. The large number of antennas required for the LWA suggests that the antenna design must be kept simple in order to maintain a low station cost. The leading candidate LWA antenna is a "big blade" antenna consisting of crossed dipole elements made of sheet aluminum. The big blade antenna has been extensively characterized and shows potential for fulfilling the technical requirements for the LWA. However, their potentially prohibitive cost has necessitated the exploration of alternate, more affordable antenna topologies. In this paper, we present one such promising topology - the fork antenna. In the following sections, we show through simulation and field measurement that the fork antenna compares closely in performance to the big blade antenna and is therefore a viable alternative to the big blade antenna in the LWA project.

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低频射电望远镜阵列候选有源天线设计

长波阵列(LWA)是一个射电望远镜阵列，目前处于开发阶段，将在未来几年内在美国新墨西哥州建成。它将由52个站点组成，每个站点有256个交叉偶极天线，并将在20 - 80 MHz频段探索宇宙。LWA所需的大量天线表明，天线设计必须保持简单，以保持较低的电台成本。主要候选LWA天线是由铝板制成的交叉偶极子元件组成的“大叶片”天线。大叶片天线已经得到了广泛的研究，显示出满足低波天线技术要求的潜力。然而，它们潜在的高昂成本使得探索替代的、更经济实惠的天线拓扑成为必要。在本文中，我们提出了一种很有前途的拓扑结构——叉形天线。在下面的章节中，我们通过仿真和现场测量表明，叉形天线在性能上与大叶片天线相当，因此在LWA项目中是大叶片天线的可行替代方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2007 IEEE Antennas and Propagation Society International Symposium

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