A 350-GHz SIS antipodal finline mixer
A 350-GHz SIS antipodal finline mixer
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350GHz SIS 对映鳍线混频器
DOI：
10.1109/22.841957
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发表时间：
2000
影响因子：
4.3
通讯作者：
S. Wulff
中科院分区：
文献类型：
--
作者：
G. Yassin;S. Withington;M. Buffey;K. Jacobs;S. Wulff
在本文中，我们描述了350 GHz鳍线超导体-绝缘体-超导体混频器的设计和操作。混频器由喇叭反射器天线馈电，超导电路采用平面电路技术和全集成调谐制作。混频器的一个重要特征是它采用了沉积在石英衬底一侧的对极鳍线部分，它将波导的高阻抗（/spl ap/300 /spl Ω/）转换为微带的低阻抗（/spl ap/20 /spl Ω/）。Nb/Al氧化物/Nb隧道结与鳍线电路同时制造。在本文中，我们描述了设计过程中的一些细节。我们特别注意鳍线锥度的综合和喇叭反射面天线的电磁设计。我们已经测试了鳍线混频器在330-370 GHz的频率范围内，并测量了90 K的接收机噪声温度，这在整个频率范围内保持不变。我们的研究表明，它是可能的，使超导鳍线混频器的频率高达350 GHz。
In this paper, we describe the design and operation of a 350-GHz finline superconductor-insulator-superconductor mixer. The mixer is fed by a horn-reflector antenna, and the superconducting circuit is fabricated using planar-circuit technology and fully integrated tuning. An important feature of the mixer is that it employs an antipodal finline section, deposited on one side of a quartz substrate, which transforms the high impedance of the waveguide (/spl ap/300 /spl Omega/) to the low impedance of the microstrip (/spl ap/20 /spl Omega/). The Nb/Al-oxide/Nb tunnel junction is fabricated at the same time as the finline circuit. In this paper, we describe the design procedure in some detail. We pay particular attention to the synthesis of the finline taper and the electromagnetic design of the horn-reflector antenna. We have tested a finline mixer over the frequency range of 330-370 GHz and measured a receiver noise temperature of 90 K, which remained unchanged over the whole frequency range. Our investigation has demonstrated that it is possible to make superconducting finline mixers for frequencies as high as 350 GHz.