Off-axis scanning of cylindrical lenses

Two aspects of cylindrical lens antennas excited by off-axis transform feeds are explored. First, the properties of the subarrays formed by the feeds at various off-axis locations are investigated to evaluate their potential for forming sector coverage patterns. Secondly, the use of transform feeds is investigated for the purpose of providing multiple scanning beams with low sidelobes and high directivity. The basic equations are presented without derivation because the method of analysis for antennas of this type with on-axis feeds is well established. The contribution of this paper is to investigate how the pattern characteristics are modified by moving the feed-axis, along a prescribed curve.