Ultra-Wideband Aperture Array Element Design for Low Frequency Radio Astronomy
Ultra-Wideband Aperture Array Element Design for Low Frequency Radio Astronomy
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DOI：
10.1109/tap.2011.2122218
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发表时间：
2011-03
影响因子：
5.7
通讯作者：
E. D. L. Acedo;N. Razavi-Ghods;L. Garcia;P. Duffett-Smith;P. Alexander
中科院分区：
文献类型：
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作者：
E. D. L. Acedo;N. Razavi-Ghods;L. Garcia;P. Duffett-Smith;P. Alexander
频率低于 1 GHz 的 21 世纪射电天文学将由数千或数百万个元件组成的阵列主导，这些元件采用密集或稀疏、规则或随机的配置，将数据传输到强大的数字后端。由有效孔径和系统噪声温度等参数指定的高性能对于实现天文学家所要求的雄心勃勃的测量速度和灵敏度至关重要。在本文中，我们分析了频率低于 500 MHz 的这些射电望远镜的超宽带阵列天线元件设计中的不同权衡和困难。需要 7:1 的带宽，同时使用薄型元件以使总体成本保持在预算范围内。
21st century Radio Astronomy at frequencies below 1 GHz will be dominated by arrays of thousands or millions of elements in configurations which are dense or sparse, regular or random, delivering data to powerful digital back-ends. High performance, specified by parameters such as the effective aperture and system noise temperature, will be crucial to achieve the ambitious survey speeds and sensitivities demanded by astronomers. In this paper we analyze the different trade-offs and difficulties in the design of ultra-wideband array antenna elements for these radio telescopes at frequencies below 500 MHz. Bandwidths of 7:1 are desired while using low-profile elements to keep the overall cost within the budget.