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

Volume

27

Issue

6

fYear

1979

fDate

11/1/1979 12:00:00 AM

Firstpage

764

Lastpage

771

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;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.1979.1142184

Filename

1142184