ISSTT Proceedings

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Gain-Bandwidth Characteristics of High- Tc Superconducting Millimeter-Wave Hot-Electron Bolometer Mixers

Authors:
Chao-Te Li, Bascom Deaver, Jr., Robert M. Weikle II, Mark Lee, Rajesh A. Rao, Chang-Beom Eom
Abstract:
The conversion gain bandwidth characteristics of millimeter-wave mixers using high-Tc superconducting YBa2Cu307 (YBCO) thin films are presented. The YBCO films are patterned into latticecooled hot-electron bolometers (HEB) coupled to an integrated antenna and transmission line. Direct heterodyne and homodyne down-conversion measurements using local-oscillator frequencies of 75 GHz and 585 GHz show overall conversion gains of -35 dB, which includes a -18 dB coupling loss. The gain bandwidth shows a simple Lorentzian roll-off with -3 dB point of 5 to 8 GHz. No second plateau in the gain spectrum has been observed, in contrast to other reports. The effective volume of the HEB is believed to be significantly smaller than the physical dimensions of the device.
Categories:
HEB Mixers
Year:
1998
Session:
3
Full-text:
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Page Number(s):
141-145