Abstract
A heterodyne imaging array to cover the 90–115 GHz frequency range is under construction at FCRAO. The mixers will use Schottky diodes operated at 20 K with integrated HEMT IF amplifiers. Response at the image frequency will be suppressed by a cooled quasi-optical filter which terminates the unwanted sideband in a 20 K load. Polarization interleaving will be used to minimize the array size on the sky. The 15 elements will form a 3×5 array with approximately 1 by 2 FWHM beamwidth spacing between pixels.
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References
C.R. Predmore, A.V. Raisanen, N.R. Erickson, P.F. Goldsmith and J.L.R. Marrero 1984, “A Broad-Band, Ultra-Low-Noise Schottky Diode Receiver from 80 to 115 GHz,” IEEE Trans. Microwave Theory Tech., MTT-32, pp. 498–507.
N.R. Erickson 1987, “A New Quasi-Optical Filter, the Reflective Polarizing Interferometer,” Int. J. Infrared and Millimeter Waves, 8, pp. 1015–1025.
P.F. Goldsmith 1982, “Diffraction Loss in Dielectric-Filled Fabry-Perot Interferometers”, IEEE Trans. Microwave Theory Tech., MTT-30, pp. 820–823.
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© 1988 Springer-Verlag
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Erickson, N.R., Goldsmith, P.F., Predmore, C.R., Viscuso, P.J. (1988). A 3mm wavelength imaging array for astronomical spectroscopy. In: Dickman, R.L., Snell, R.L., Young, J.S. (eds) Molecular Clouds in the Milky Way and External Galaxies. Lecture Notes in Physics, vol 315. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-50438-9_331
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DOI: https://doi.org/10.1007/3-540-50438-9_331
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