Design of the axially displaced ellipse antenna with low profile at W band

This paper presents the axially displaced ellipse antenna with low profile at W band. The antenna configuration consists of an ellipsoid as the subreflector and a combination of series of paraboloids with different focal lengths, which called subzone paraboloid, as the main reflector to keep low profile. Closed-form design equations are derived using the principles of geometrical optics. Two-dimension finite-difference time-domain method is introduced to obtain the characteristics of subzone paraboloid. CST is implemented to further analyze this antenna. The bandwidth of the antenna can be improved by adjusting the height of each paraboloid of the main reflector. Simulated results show that this antenna exhibits good radiation performance and is suitable for radar and communication system at W band.