ISSTT Proceedings

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Gain and Noise Spectra for YBa2Cu307 Hot-Electron Bolometer Mixers

Authors:
C.-T. Li, G. Schoenthal, B. S. Deaver, Jr., R. M. Weikle II, Mark Lee, R. A. Rao, C. B. Eom
Abstract:
The conversion gain and output noise spectra for YBCO hot-electron bolometer (HEB) mixers will be presented. Devices were formed from a small area of YBCO thin film, with nominal physical dimensions of 1 µm (wide) × 2 µm (long) × 1000 Å (thick). coupled to planar log-periodic antennas. Two tunable Gunn oscillators, providing several mW radiation from 75 to 106 GHz, were used. One acted as the LO, the other one as the RF. Both signals were combined first with a 3 dB directional coupler before emerging from a corrugated feedhom. Measurements were performed quasi-optically. with the devices mounted on the back of a Si extended hemispherical lens, and coupling losses estimated 12 dB. Within the IF range (2-18 GHz, set by the amplifiers we were using), single Lorentzian roll-off bandwidths were observed for mixer conversion gain, with conversion efficiency close to -18 dB around 2 GHz, and 3 dB bandwidth ~6 GHz.
Categories:
High TC, Hot Electron Bolometers
Year:
1999
Session:
4
Full-text:
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Page Number(s):
168