Computer Science – Performance
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978itmtt..26..629b&link_type=abstract
IEEE Transactions on Microwave Theory and Techniques, vol. MTT-26, Sept. 1978, p. 629-635.
Computer Science
Performance
C Band, Cryogenics, Dicke Radiometers, Integrated Circuits, Junction Diodes, Microwave Switching, P-I-N Junctions, Radio Astronomy, Cooling Systems, Insertion Loss, Low Noise, Matrices (Circuits), Microwave Radiometers, Noise Temperature, Performance Tests, Switching Circuits
Scientific paper
A low-loss cryogenically cooled (20 K) eight port C-band p-i-n diode switch has been developed for radio astronomy applications. The switching functions are achieved through the use of eight p-i-n diodes in a stripline package. Maximum measured loss and VSWR over the 4.4-5.1-GHz band are 0.75 dB and 1.5:1, respectively. The average measured noise temperature is 9.8 K. The switch provides operational versatility for a dual-channel dual-band (C- and L-bands) radiometer by simultaneously performing as a Dicke switch, a feed/load selector switch, and a band selector switch. The switch performs these functions at a noise temperature unobtainable with commercially available switches.
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