Phased Arrays

This chapter discusses the particular problems of phased arrays by considering the effects of phase shifters and feed networks. Fixed phase shifters cause the beam to scan as frequency changes and limits bandwidth or can be used to scan a series fed array. Phase shifter quantization causes sidelobes and errors reduce gain. Element position or existence taper is used to reduce sidelobes. Constrained corporate or space feeds are analyzed. Adaptive array nulls reduce interference and can improve radar or communication systems (smart antenna).