Title :
An antenna for dual-wavelength radiometry at 21 and 32 GHz
Author :
Hogg, David C. ; Guiraud, F.O. ; Howard, Joe ; Newell, Allen C. ; Kremer, Douglas P. ; Repjar, Andrew G.
Author_Institution :
Environmental Res. Labs., NOAA, Boulder, CO, USA
fDate :
11/1/1979 12:00:00 AM
Abstract :
Accurate multiwavelength remote sensing of the atmosphere requires antennas with the same beamwidth at the various frequencies of operation. A single offset antenna with a corrugated feed which meets this criterion at 20.6 and 31.65 GHz is described. The planar near-field (PNF) scanning facility at the National Bureau of Standards (NBS) was utilized to measure the near-field patterns of the overall antenna for various feed positions, and with an apodizer placed on the reflector. Comparison of the far-field patterns, calculated using PNF methods, yielded the optimum configuration. In addition, the facility was used as a far-field range to measure the radiation pattern of the feed. The antenna is presently installed at Stapleton International Airport, Denver, CO, in a dual-channel radiometric system which continuously remotely senses water vapor and liquid, and it is performing satisfactorily.
Keywords :
Corrugated horn antennas; Horn antennas, corrugated; Microwave radiometry; Millimeter-wave radiometry; Multifrequency antennas; Offset reflector antennas; Reflector antennas, offset; Antenna feeds; Antenna measurements; Atmosphere; Atmospheric measurements; Frequency; NIST; Position measurement; Radiometry; Reflector antennas; Remote sensing;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.1979.1142184
