Full-scale antenna patterns have been taken at the nasa to determine the absolute gain as a function of spacecraft aspect angle. the flush-mounted antenna system consists of four cavity-backed helices that are mounted 90 grad apart around the maximum radius point of the cone-shaped command module and associated selection switches. A description of the test setup, measurement techniques, and computer analysis is given. for optimum switching, the percent coverage at a perfect right-circulary polarized isotropic level is found to be 80 percent of the sphere or greater for each configuration tested.
S-band antenna measurements for manned flight on apollo program
Microwave Journal ; 12 , 12 ; 71-74
1969
4 Seiten, 6 Bilder, 1 Tabelle, 3 Quellen
Article (Journal)
English
ANTENNE , DIAGRAMM , MESSUNG , MIKROWELLE , RAUMFAHRT
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