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Noise Behaviour of a THz Superconducting Hot-Electron Bolometer Mixer |
ZHANG Wen 1,3;LI Ning1;JIANG Ling1;MIAO Wei1;LIN Zhen-Hui1;YAO
Qi-Jun1;SHI Sheng-Cai1;CHEN Jian2;WU Pei-Heng2;S. I. Svechnikov3;Yu. B. Vachtomin3;S. V. Antipov3;B. M. Voronov3;G. N. Gol'tsman3 |
| 1Purple Mountain Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 2100082Department of Electronic Science and Engineering, Nanjing University, Nanjing 2100933Department of Physics, Moscow State Pedagogical University, Moscow 119992, Russia |
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| Cite this article: |
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ZHANG Wen, LI Ning, JIANG Ling et al 2007 Chin. Phys. Lett. 24 1778-1781 |
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Abstract A quasi-optical superconducting NbN hot-electron bolometer (HEB) mixer is measured in the frequency range of 0.5--2.5THz for understanding of the frequency dependence of noise temperature of THz coherent detectors. It has been found that noise temperature increasing with frequency is mainly due to the coupling loss between the quasi-optical planar antenna and the superconducting HEB bridge when taking account of non-uniform distribution of high-frequency current. With the coupling loss corrected, the superconducting HEB mixer demonstrates a noise temperature nearly independent of frequency.
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| Keywords:
95.55.Jz
95.85.Bh
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Received: 05 March 2007
Published: 17 May 2007
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| PACS: |
95.55.Jz
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(Radio telescopes and instrumentation; heterodyne receivers)
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95.85.Bh
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(Radio, microwave (>1 mm))
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