Article

Cryogenically cooled K‐band high electron mobility transistor receiver for radio astronomical observation

Nobeyama Radio Observatory, Tokyo Astronomical Observatory, University of Tokyo, Minamimaki‐mura, Minamisaku‐gun, Nagano 384‐13, Japan
Review of Scientific Instruments (impact factor: 1.37). 04/1987; DOI:10.1063/1.1139292 pp.379 - 382
Source: IEEE Xplore

ABSTRACT A K‐band receiver using cooled high‐electron mobility‐transistor (HEMT) amplifiers was developed at the Nobeyama Radio Observatory (NRO). Remarkable reduction of receiver noise temperature T rec was obtained when it was cooled down to cryogenic temperature. The lowest T rec of 75 K was obtained at 23.4 GHz. This low noise characteristic reveals that the cooled HEMT amplifier is promising as a sensitive receiver for radio astronomical observations.

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Keywords

cooled HEMT amplifier
 
cryogenic temperature
 
HEMT
 
high‐electron mobility‐transistor
 
low noise characteristic
 
lowest T rec
 
Nobeyama Radio Observatory
 
radio astronomical observations
 
receiver noise temperature T rec
 
Remarkable reduction
 
sensitive receiver