H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/54
H01Q 3/12 (2006.01) H01Q 19/19 (2006.01)
Patent
CA 1039843
ABERRATION CORRECTING SUBREFLECTORS FOR TOROIDAL REFLECTOR ANTENNAS ABSTRACT OF THE DISCLOSURE The correction of aberration in toroidal reflector antennas by a novel type of subreflector is disclosed. The specific shape of the subreflector ultimately depends on the geometry of the toroidal reflector. However, in any case, the effect of the subreflector is to achieve a point focus in a system which, without the subreflector, does not focus at a point. Considering the antenna system from a radiation point of view, this is equivalent to turning a non-planar equiphase surface in the aperture into a plane thereby eliminating the phase error about the aperture plane perpendicular to the desired direction of propagation. This is achieved while preserving the wide field of view characteristic of the torus antenna by designing the subreflector so that all pathlengths from a reference plane are constant and equal to a desired reference pathlength. In a practical case, the design of the subreflector is accomplished by developing a heuristic geometric optics model of the focusing properties of the toroidal reflector and using a programmable general purpose digital computer to generate the subreflector shape by numerically computing points on the surface of the subreflector for separate, individual rays intercepted by the toroidal reflector, for a bundle of rays incident from the desired direction. These points may then be used to machine the subreflector surface using well-known numerically controlled milling machines. Of special significance is an optimum antenna configuration using what may be termed a "Cassegorian" subreflector designed according to the principles of the invention having similarities to both Cassegorian and Gregorian subreflectors.
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