| タイトル | A low noise 230 GHz heterodyne receiver employing .25 sq micron area Nb/AlO(x)/Nb tunnel junctions |
| 著者（英） | Leduc, H. G.; Kooi, Jacob W.; Bumble, B.; Chan, M.; Phillips, T. G. |
| 著者所属（英） | NASA Headquarters; Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 1992-05-01 |
| 言語 | eng |
| 内容記述 | Recent results for a full height rectangular waveguide mixer with an integrated IF matching network are reported. Two 0.25 sq micron Nb/AlO(x)/Nb superconducting insulating superconducting (SIS) tunnel junctions with a current density of about 8500 A/sq cm and omega RC of about 2.5 at 230 GHz have been tested. Detailed measurements of the receiver noise have been made from 200-290 GHz for both junctions at 4.2 K. The lowest receiver noise temperatures were recorded at 239 GHz, measuring 48 K DSB at 4.2 K and 40 K DSB at 2.1 K. The 230 GHz receiver incorporates a one octave wide integrated low pass filter and matching network which transforms the pumped IF junction impedance to 50 ohms over a wide range of impedances. |
| NASA分類 | ELECTRONICS AND ELECTRICAL ENGINEERING |
| レポートNO | 92A46069 |
| 権利 | Copyright |
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