Electromagnetic performance comparisons of 0.85 THz integrated bias-tee SIS mixers with twin-junction and end-loaded tuning schemes

Electromagnetic performance comparisons of 0.85 THz integrated bias-tee SIS mixers with twin-junction and end-loaded tuning schemes
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具有双结和端载调谐方案的 0.85 THz 集成偏置 T 型 SIS 混频器的电磁性能比较

DOI:
10.1117/12.2628733
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发表时间:
2022
期刊:
--
影响因子:
--
通讯作者:
Tan B
Tan B
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文献类型:
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作者:
Tan B

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我们比较了两个0.85太赫兹SIS混频器的设计与径向探头天线对准的E-平面的输入全高矩形波导连接到一个钻光滑壁喇叭。两种设计均采用相同的0.5 µ m2混合Nb/AlN/NbN隧道结技术,夹在NbTiN接地层和40 µm石英衬底顶部的铝布线层之间。这两种设计的不同之处在于我们如何调谐出不需要的结电容,以实现宽带性能。第一种设计使用常用的双结调谐方案,而第二种设计利用端部加载方案。我们成功地实现了接近2倍的双边带量子噪声性能的两种方案,但双结设计是不敏感的平面电路元件的制造精度。然而,端部加载设计提供了更好的中频带宽性能,几乎是双结设计的两倍。超宽带中频混频器的需求变得越来越迫切和重要的各种毫米(mm)和亚毫米天文仪器的未来和即将到来的升级,因此,我们得出结论,端部加载的设计是一个更好的解决方案太赫兹外差混频应用。
We compare the design of two 0.85 THz SIS mixers fed with a radial probe antenna aligned to the E-Plane of the input full-height rectangular waveguide connected to a drilled smooth-walled horn. Both designs employ the same 0.5 µm2hybrid Nb/AlN/NbN tunnel junction technology, sandwiched between a NbTiN ground and aluminium wiring layer fabricated on top of a 40 µm quartz substrate. The two designs is differed by how we tune out the unwanted junction capacitance for broadband performance. The first design uses the commonly-used twin-junction tuning scheme; whilst the second design utilises an end-loaded scheme. We successfully achieve close to 2× the double sideband quantum noise performance for both schemes, but the twin-junction design is less sensitive to fabrication accuracy of planar circuit components utilised. However, the end-loaded design offers a much better IF bandwidth performance, almost twice wider than the twin-junction design. The need for an ultra-wide IF bandwidth mixer is becoming more pressing and important for the future and up-coming upgrades of various millimetre (mm) and sub-mm astronomical instruments, hence we conclude that the end-loaded design is a better solution for the THz heterodyne mixing applications.
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