The Band 3 Receiver (84-116 GHz) for ALMA

Details The Band 3 Receiver (84-116 GHz) for ALMA The Band 3 Receiver (84-116 GHz) for ALMA

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005imw..conf..407c&link_type=abstract

The Joint 30th International Conference on Infrared and Millimeter Waves and 13th International Conference on Terahertz Electron

Physics

1

Scientific paper

Test results are presented of the Band 3 module integrated into the Atacama large millimeter array (ALMA) front end receiver. The 84 to 116 GHz collected signal by the Band 3 receiver is split into two orthogonal polarisations using an orthomode transducer and then down-converted to 6 GHz over 4 GHz bandwidth using sideband separating mixers with better than 10 dB of image rejection. The single sideband system's low noise of 35 to 45 K is achieved by cascading superconductor-insulator-superconductor (SIS) mixers and low noise cryogenic amplifiers that consist of three stage high mobility transistors (HEMT) operating at 4 K.

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