A 700-GHz SIS antipodal finline mixer fed by a Pickett-Potter horn-reflector antenna
A 700-GHz SIS antipodal finline mixer fed by a Pickett-Potter horn-reflector antenna
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由 Pickett-Potter 喇叭反射器天线馈电的 700 GHz SIS 对足鳍线混频器
DOI：
10.1109/tmtt.2004.835976
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发表时间：
2004
影响因子：
4.3
通讯作者：
S. Wulff
中科院分区：
文献类型：
--
作者：
P. Kittara;P. Grimes;G. Yassin;S. Withington;K. Jacobs;S. Wulff
我们报道了超导体-绝缘体-超导体（SIS）鳍线混频器在Nb超导能隙附近的成功运行。混频器采用了一种新型的Pickett-Potter喇叭反射器（PPHR）天线，它具有低旁瓣和低交叉极化水平，但易于制造。SIS隧道结和所有的集成超导调谐电路是由Nb使用平面电路技术制造的。混频器采用沉积在石英衬底一侧的对跖鳍线部分，其将波导的高阻抗（/spl ap/300 /spl Ω/）转换为微带线的低阻抗（/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，我们描述了混频器的设计和测试，并特别关注的PPHR天线的电磁设计。我们调查的噪声温度和增益的混频器在642-714 GHz，并分析了实验结果，使用严格的理论，专门为目的而开发的。我们的研究表明，鳍线混频器具有良好的性能低于和高于超导能隙。
We report the successful operation of a superconductor-insulator-superconductor (SIS) finline mixer operating near the superconducting energy gap of Nb. The mixer employs a new type of Pickett-Potter horn-reflector (PPHR) antenna, which exhibits low sidelobes and low cross-polarization levels, and yet is easy to fabricate. The SIS tunnel junction and all of the integrated superconducting tuning circuits are fabricated from Nb using planar-circuit technology. The mixer 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 line (/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 and testing of the mixer, and pay particular attention to the electromagnetic design of the PPHR antenna. We investigate the noise temperature and gain of the mixer over 642-714 GHz, and analyze the experimental results using rigorous theories that were developed specifically for the purpose. Our investigation demonstrates that finline mixers have good performance both below and above the superconducting energy gap.