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arXiv 2301.06708astro-ph.IM
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用于SKA低频射电望远镜的天线

Antennas for low-frequency radio telescope of SKA

Agaram Raghunathan, Keerthipriya Satish, Arasi Sathyamurthy, T. Prabu, B. S. Girish, K. S. Srivani, Shiv K. Sethi

AI总结:

本文综述了全球多个工程团队为SKA低频射电望远镜(50–350 MHz)提出的多种宽带天线候选方案,并依据互耦、栅瓣、极化纯度等指标评估其对主要科学目标的适用性。

摘要:

平方公里阵列(SKA)的低频射电望远镜正由国际射电天文界建造,旨在(i)在50–350 MHz频率范围内实现比任何现有设施高数个数量级的灵敏度,以及(ii)能够以快数百倍的速度绘制天空图像。射电望远镜阵列的灵敏度通常取决于用于接收天空信号的电磁传感器数量。传感器元件的总数进一步受到元件间互耦效应、辐射方向图中允许的栅瓣等因素的限制。工作频带由所期望的空间和频谱响应、可接受的旁瓣和后瓣电平、辐射效率、极化纯度以及传感器响应的可校准性决定。本文简要回顾了全球多个工程团队为覆盖50–350 MHz频率范围的SKA低频射电望远镜考虑的几种宽带天线,这些天线被视为潜在候选方案,评估依据是它们是否适合开展主要科学目标。

英文摘要:

The low-frequency radio telescope of the Square Kilometre Array (SKA) is being built by the international radio astronomical community to (i) have orders of magnitude higher sensitivity and (ii) be able to map the sky several hundred times faster, than any other existing facilities over the frequency range of 50 - 350 MHz. The sensitivity of a radio telescope array is in general, dependent upon the number of electromagnetic sensors used to receive the sky signal. The total number of them is further constrained by the effects of mutual coupling between the sensor elements, allowable grating lobes in their radiation patterns, etc. The operating frequency band is governed by the desired spatial and spectral responses, acceptable sidelobe and backlobe levels, radiation efficiency, polarization purity and calibratability of sensors' response. This paper presents a brief review of several broadband antennas considered as potential candidates by various engineering groups across the globe, for the low-frequency radio telescope of SKA covering the frequency range of 50 - 350 MHz, on the basis of their suitability for conducting primary scientific objectives.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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