Computer Science – Performance
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mijo...33..122d&link_type=abstract
Microwave Journal (ISSN 0192-6225), vol. 33, Aug. 1990, p. 122-124, 126.
Computer Science
Performance
Gallium Arsenides, High Electron Mobility Transistors, Neptune (Planet), Very Large Array (Vla), Voyager 2 Spacecraft, Antenna Arrays, Field Effect Transistors, Power Amplifiers, Space Missions
Scientific paper
The great commmunications success achieved in the Voyager 2-Neptune encounter can be in part attributed to the HEMT-based amplifiers used in the ground receivers for the mission, which ensured a low-noise performance of the receivers. This paper describes the HEMT history for the Voyager and Neptune encounter and points out the advantages of HEMTs over masers and FETs. It is shown that HEMTs have the lowest noise figures to date at frequencies up to 94 GHz. Moreover, at 44 and 60 GHz frequencies used for new military communications satellites, HEMT low-noise amplifier technology makes it possible to reduce noise by 1 to 2 dB of the FET levels.
Adams Barbara Craig
Duh H. George K.
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