Noise temperature measurement of YBCO Josephson mixers in millimeter and submillimeter waves
Noise temperature measurement of YBCO Josephson mixers in millimeter and submillimeter waves
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DOI：
10.1109/77.621770
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发表时间：
1997-06
影响因子：
1.8
通讯作者：
H. Shimakage;Y. Uzawa;M. Tonouchi;Z. Wang
中科院分区：
文献类型：
--
作者：
H. Shimakage;Y. Uzawa;M. Tonouchi;Z. Wang
我们研究了YBCO阶跃边缘约瑟夫森结作为毫米波和亚毫米波混频器。这些混频器集成了一个Au薄膜对数周期天线设计的宽带耦合的辐射。我们估计的噪声温度的混频器使用传统的热/冷黑体照射技术在100-和300-GHz频段。结果表明，Au薄膜天线的耦合效率比YBCO薄膜天线高5dB左右，噪声温度从2,800 K降低到1,800 K。通过改进阻抗匹配，在300 GHz频段实现了最佳接收机噪声温度1,200 K。
We have investigated YBCO step-edge Josephson junctions as millimeter and submillimeter wave mixers. These mixers were integrated with an Au thin-film log-periodic antenna designed for broadband coupling of the radiation. We estimated the noise temperature of the mixer using conventional hot/cold blackbody irradiation techniques in the 100- and 300-GHz bands. We found that the Au thin-film antenna yielded about 5 dB higher coupling efficiency than that of YBCO thin film antenna, and the noise temperature decreased from 2,800 K to 1,800 K. The best receiver noise temperature, 1,200 K, was achieved in the 300-GHz band through improvement in impedance matching.