Accession Number : AD0426029

Title :   RAY-THEORY ANALYSIS OF DEFOCUSED CIRCULARSYMMETRIC REFLECTOR ANTENNAS,

Corporate Author : WHEELER LABS INC GREAT NECK N Y

Personal Author(s) : Lopez,Alfred R.

Report Date : 10 OCT 1963

Pagination or Media Count : 39

Abstract : Radiation patterns for narrow-beam reflector antennas operating near focus have been analyzed using standard aperture integration techniques. For the highly-defocused case, these techniques are more restricted and generally more difficult to apply. For this case, it is shown that ray-theory provides a good means of predicting radiation characteristics. Three methods for determining far-field amplitude and phase characteristics are presented. The first is the standard aperture integration method; the second employs ray-theory principles; and the third uses a ray-theory simplification, namely paraxial theory. An attempt is made to determine the amount of defocusing required in order that ray-theory rechniques are applicable. The paraboloidal reflector and Cassegrain are the antenna types discussed. The methods presented, however, can be applied to any circularlysymmetric reflector antenna. (Author)

Descriptors :   (*PARABOLIC ANTENNAS, ANTENNA RADIATION PATTERNS), (*ANTENNA RADIATION PATTERNS, MATHEMATICAL PREDICTION), RADAR ANTENNAS, FOCUSING, REFLECTION, GEOMETRY, ANTENNA FEEDS, EQUATIONS, REFLECTORS, NUMERICAL INTEGRATION, TRIGONOMETRY

Distribution Statement : APPROVED FOR PUBLIC RELEASE