PHASED ARRAY RADAR STUDIES

Research effort was directed toward the investigation of components, techniques, and fundamental theoretical limitations of arrays for long-range radar applications. Research on components for arrays includes low-noise RF amplifiers, highpower modular transmitters, high-speed building blocks for data- processing systems, high-speed microwave switches and several types of phase shifting devices. The techniques work placed emphasis on low-loss simultaneous beam-forming techniques for array receivers. The techniques of controlling and monitoring arrays making use of novel transmitting and receiving approaches were also investigated. Studies of the fundamentals of arrays were largely confined to efforts toward better understanding of the phenomena of mutual coupling in antenna arrays and the effects of errors, both unintentional and intentional, on the properties of array patterns.