A dual-frequency mm-wave radiometer antenna for airborne remote sensing of atmosphere and ocean. (Technical feature)

Microwave Journal, September, 1994 by Fedor, Leonard S.; Francis, Michael H.; Hazen, Duane A.; Jacobson, Mark D.; Kremer, Douglas P.; Madsen, William B.

Accurate multiwavelength radiometric remote sensing of the ocean and the atmosphere from an aircraft requires antennas with the same beamwidth at the various frequencies of operation. An offset antenna was designed with a presurre-compensating corrugated feed horn to meet this criterion. A specially designed fairing was incorporated into the antenna to optimize the aerodynamics and minimize the liquid build up on the antenna surfaces. The antenna has two positions, the zenith (up) position and the nadir (down) position. The far-field pattern results show that the antenna bandwidths at 23.87 and 31.65 GHz agree well with design criterion. This antenna was recently used in an ocean remote-sensing experiment and performed according to expectations.

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