Title :
A compact EHF dual-frequency antenna for ASCAMP
Author_Institution :
MIT Lincoln Lab., Lexington, MA, USA
Abstract :
A compact, high-performance, dual-band antenna has been developed for use with ASCAMP (advanced single-channel antijam man-portable). It consists of a compact feed with an elliptical subreflector which produces the required focus ring for a displaced axis parabolic reflector. The main reflector of the antenna, which weights 2.6 pounds, is made up of six lightweight petals which can be separated and nested for easy portability. Because the petals in the assembled antenna do not mate up perfectly, the aperture illumination efficiency of the antenna is reduced relative to a single-piece reflector by 0.9 dB and 0.2 dB at 44.5 GHz and 20.7 GHz, respectively. Even with this added loss, however, the efficiency of the final design is better than 53% in both frequency bands. The author discusses the considerations which led to the final antenna design, describes the antenna´s mechanical configuration, and presents measured performance test results
Keywords :
military equipment; reflector antennas; satellite antennas; satellite ground stations; 20.7 GHz; 44.5 GHz; 53 percent; ASCAMP; EHF; EHF dual-frequency antenna; SHF; advanced single-channel antijam man-portable; antenna design; aperture illumination efficiency; compact antenna; compact feed; displaced axis parabolic reflector; elliptical subreflector; focus ring; frequency bands; measured performance test results; mechanical configuration; Antenna measurements; Aperture antennas; Assembly; Dual band; Feeds; Frequency; Lighting; Mechanical variables measurement; Reflector antennas; Testing;
Conference_Titel :
Military Communications Conference, 1991. MILCOM '91, Conference Record, Military Communications in a Changing World., IEEE
Conference_Location :
McLean, VA
Print_ISBN :
0-87942-691-8
DOI :
10.1109/MILCOM.1991.258444
