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ELECTRONICALLY STEERABLE FIELD REFLECTOR TECHNIQUES.
AIRBORNE INSTRUMENTS LAB DEER PARK N Y
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A theoretical study of antenna systems consisting of two concave reflectors illuminated by an appropriately shaped cluster of feeds so arranged that the aperture blocking usually caused by the secondary reflector is eliminated has been conducted using a digital computer. The size, contour, and position of the cluster feed surface has been investigated in relation to different shaped field reflectors as the sizes and positions of the field reflectors are varied. The radiation patterns of several field reflector configurations for boresight and off-axis operation are included and the field reflector system is shown to maintain a higher peak power than a comparable offset cluster when scanned. There is no deterioration of pattern quality in the field reflector system. The field reflector system is shown to be capable of correcting for considerable distortion of various types. An example of the sum and difference patterns formed by the field reflector system is illustrated. Successive beam-broadening is shown, with a factor of 3.88 obtained from an 11-feed field reflector system. Author
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