
Accession Number : AD0426029
Title : RAYTHEORY 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 narrowbeam reflector antennas operating near focus have been analyzed using standard aperture integration techniques. For the highlydefocused case, these techniques are more restricted and generally more difficult to apply. For this case, it is shown that raytheory provides a good means of predicting radiation characteristics. Three methods for determining farfield amplitude and phase characteristics are presented. The first is the standard aperture integration method; the second employs raytheory principles; and the third uses a raytheory simplification, namely paraxial theory. An attempt is made to determine the amount of defocusing required in order that raytheory 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