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Application of cubic‐phase theory to galindo‐williams subreflector
Author(s) -
Rahnavard M. H.,
Rusch W. V. T.
Publication year - 1991
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.4650040411
Subject(s) - fortran , reflector (photography) , geometrical optics , aperture (computer memory) , computation , surface (topology) , mathematics , physical optics , optics , geometry , physics , computer science , algorithm , light source , acoustics , operating system
A JPL Fortran program for designing the main reflector and the subreflector of a Galindo‐Williams system with a constant intensity over the aperture of the main reflector was modified for use on our computer system. Geometrical optics and conservation of energy are the basic laws used for designing this type of surface. The basic computation is a numerical solution of three simultaneous differential equations. The resulting subreflector is a type of inflected surface. Analysis of the fields scattered from such a surface using physical optics yields adequate results. Cubic‐phase theory is numerically applied to the Galindo‐Williams surface. Although the technique appeared to yield results accurate to within 10%‐15%, the nearness of the edge to the turning point caused a coupling of the edge and turning‐point solutions, which prevented higher accuracy.