SIMULTANEOUS SUM AND DIFFERENCE PATTERN TECHNIQUE FOR CIRCULAR ARRAY ANTENNAS

摘要

Apparatus for obtaining simultaneous sum and difference patterns with a circular-array antenna fed by an R-2R parallel-plate lens systems. The apparatus comprises sum and difference circuits which in combination with switching circuitry can provide a plurality of different combinations of amplitude taper to a multiple input/output port lens system to achieve 360 DEG scan from an array antenna fed thereby. A sum power divider and a difference power divider are connected directly and through 180 DEG hybrid couplers respectively, to one side of a DPDT, amplitude pass-around switch to provide selectively predetermined combinations of the outputs of the two power dividers. The resulting combinations are fed to the ports of the lens system in a conventional manner. The sum pattern is used for transmission, and both the sum and difference patterns are used on reception.