Contents I. Introduction
Mechanically changing a reflector antenna to create a desired null can be done in several ways. In [1], the actuators of an electrostatic reflector antenna are adaptively adjusted to place a null in the far-field pattern. In a similar manner, the surface of an 85 cm diameter offset mesh reflector at 10 GHz is adjustable at 52 points in order to shape the reflector to produce a desirable pattern [2]. Points on the reflector surface are pulled back until a null forms in the desired direction. The authors suggest that the adaptation process only be done while the desired signal is not present. They state that at least two mesh control points are needed to place a null and that nulls cannot be placed in some regions of space.
