论文信息 - Multiband Low-Noise Receivers for a Very Large Array

Multiband Low-Noise Receivers for a Very Large Array

The very large array (VLA), presently under construction by the National Radio Astronomy Observatory, is an array of 27 25-m-diam antennas. This paper describes the feed and low-noise, front-end systems used on the antennas. The receiving system allows operation at any one of the four frequency bands: 1.35-1.73 GHz, 4.5-5.0 GHz, 14.4-15.4 GHz, 22-24 GHz. The feed system uses an offset Cassegrain geometry so that the feeds for all four frequency bands can be in position on the antenna simultaneously. The front end comprises a cryogenically cooled parametric amplifier for the 4.5-5.0-GHz range. This paramp is preceded by cooled upconverters or cooled mixers for the other frequency ranges. Measured system performance is presented and some construction details are given.

P. Napier | S. Weinreb | S. Maas | M. Balister

[1] F. SciambiA. The effect of the aperture illumination on the circu lar aperture antenna pattern characteristics , 1965 .

[2] Dan A. Bathker,et al. Low-noise microwave receiving systems in a worldwide network of large antennas , 1973 .

[3] William F. Williams,et al. High Efficiency Antenna Reflector , 1965 .

[4] M. Ryle,et al. The New Cambridge Radio Telescope , 1962, Nature.

[5] Anthony R. Kerr,et al. Cryogenic cooling of mixers for millimeter and centimeter wavelengths , 1973 .

[6] A. W. Rudge,et al. New class of primary-feed antennas for use with offset parabolic-reflector antennas , 1975 .

[7] J. Baars. The measurement of large antennas with cosmic radio sources , 1973 .

[8] R. Quinn,et al. Low-noise receivers: Microwave maser development , 1977 .

[9] Y. L. Chow,et al. On designing a supersynthesis antenna array , 1972 .

[10] J. Greene. Low-noise, wideband, uncooled preamplifier , 1970 .

[11] R. Caldecott,et al. High performance S-band horn antennas for radiometer use , 1973 .

[12] T. Chu,et al. Depolarization properties of offset reflector antennas , 1973 .

[13] A. W. Rudge,et al. Beam squint in circularly polarised offset-reflector antennas , 1975 .

[14] David S. Heeschen,et al. The Very Large Array , 1975 .

[15] Ming Chen,et al. A wide-band square-waveguide array polarizer , 1973 .