摘要
在超低噪声系统中,天线欧姆损耗噪声也是很重要的。利用金属导体表面的电磁波传播的反射系数,推导出不同极化波的反射面天线金属表面欧姆损耗引起的噪声温度计算公式。以铝合金面板为例,计算了多频段65 m射电天文望远镜天线欧姆损耗的噪声温度。依据计算结果论述了天线欧姆损耗噪声的变化规律。
Noise due to antenna ohmic loss is important in ultralow noise system. In this paper, by using reflection coefficients of electromagnetic wave on the metal surface, the author derives calculation formula of noise temperature due to reflector antenna metallic surface ohmic loss of different polarization wave. Take aluminum alloy antenna surface plate for example, noise temperature of multi-band 65 m radio telescope antenna metallic surface ohm loss is calculated. According to the calculation results, the paper discusses the varying rules of antenna ohmic loss noise.
出处
《中国电子科学研究院学报》
2009年第4期408-411,共4页
Journal of China Academy of Electronics and Information Technology
关键词
反射系数
欧姆损耗
噪声温度
反射面天线
reflection coefficient
ohmic loss
noise temperature
reflector antenna
