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首页> 外文期刊>Journal of Astrophysics and Astronomy >Antennas for low-frequency radio telescope of SKA
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Antennas for low-frequency radio telescope of SKA

机译：SKA低频射电望远镜天线

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Abstract 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.
机译：摘要 国际射电天文学界正在建造平方公里阵列（SKA）的低频射电望远镜，其灵敏度要高出几个数量级，（ii）能够在50-350 MHz的频率范围内比任何其他现有设施快数百倍。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的数量。它们的总数进一步受到传感器元件之间相互耦合的影响、其辐射方向图中允许的光栅瓣等因素的限制。工作频段由所需的空间和光谱响应、可接受的旁瓣和后瓣电平、辐射效率、偏振纯度和传感器响应的可校准性决定。本文简要回顾了全球各个工程团队认为是SKA低频射电望远镜潜在候选天线的几种宽带天线，覆盖50-350 MHz的频率范围，基于它们对进行主要科学目标的适用性。

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