TIME DOMAIN ANTENNA TECHNIQUES
HUGHES AIRCRAFT CO CULVER CITY CA CULVER CITY United States
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Time modulation of array antennas was applied to the problems of obtaining ultra-low sidelobe and simultaneously scanned antenna patterns. A design analysis is presented for a linear array which obtains reduced sidelobe levels by on-off switching of the individual array elements and subsequent filtering of the array output signal. A simplified experimental array design is presented, and the switching circuitry developed for this ultra-low sidelobe array is described. Stable transmitting and receiving equipment, designed for time domain applications, is discussed and performance characteristics of the equipment are given. The final results of the tests of the antenna pattern range are presented. Measurements to determine the repeatability of low sidelobe patterns are discussed. It is concluded that 40 db sidelobes can be measured to within 1.5 db on the present range. The basic theory of the technique of simultaneous scan is given. An experimental array and its required control circuitry are under development.