Zoom Feed Technique Study.

摘要

The final report covers the period 10November 1972through 10November 1973. During that period several tasks were accomplished,all of which pertain to large-element,limited-scan phased arrays. The first task was development of a feed system concept for multiple-ring planar arrays in which the sum and difference channels can be separately optimized in circularly-symmetrical aperture modes,and duplexing can be accomplished using the elemental phase shifters. The second task was reduction of this concept to practice in a single ring of 16elements,and the third task was development of a circularly-symmetrical,optimum-difference pattern in which maximum sensitivity is obtained for a given side lobe level. The synthesized distribution is actually a circular version of the Bayliss aperture weighting. (Author)