Title :
A 15 element focal plane array for 100 GHz
Author :
Erickson, Neal R. ; Goldsmith, Paul F. ; Novak, G. ; Grosslein, Ronald M. ; Viscuso, P.J. ; Erickson, Ronna B. ; Predmore, C. Read
Author_Institution :
Dept. of Phys. & Astron., Massachusetts Univ., Amherst, MA, USA
fDate :
1/1/1992 12:00:00 AM
Abstract :
A focal plane imaging array receiver is described which covers the 86-115 GHz frequency range for radio astronomical observations. The 3×5 element array uses cryogenic Schottky diode mixers with integrated HEMT IF amplifiers. A cold quasi-optical filter selects the desired sideband, and terminates the image at 20 K. Polarization interleaving is used to minimize the array size on the sky. LO power is provided by a frequency tripled YIG tuned oscillator. The average receiver noise temperature of the array pixels varies from 250-350 K SSB depending on the frequency. Only three mechanical tuners are used in the system and all functions are under computer control
Keywords :
Schottky-barrier diodes; electromagnetic wave polarisation; microwave detectors; microwave imaging; mixers (circuits); radiotelescopes; receivers; 100 GHz; 20 K; 85 to 115 GHz; MM-wave type; cold quasi-optical filter; computer control; cryogenic Schottky diode mixers; focal plane array; frequency tripled YIG tuned oscillator; imaging array receiver; integrated HEMT IF amplifiers; mechanical tuners; millimetre wave regions; polarisation interleaving; radio astronomical observations; Cryogenics; Filters; Frequency; HEMTs; Interleaved codes; Oscillators; Polarization; Radiofrequency amplifiers; Receivers; Schottky diodes;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
