Circular array for satcom interference rejection

A useful application of antenna arrays is interference rejection. This paper describes a circular antenna array that was designed to reject interference in a mobile satellite receiver from a close-proximity source of interference. Since this interference source can move relative to the satellite antenna, the antenna array must adaptively adjust its null direction accordingly. The particular design of the circular array necessitated a significant size reduction in the radiating elements. Therefore, size reduction techniques were applied to circular patch antennas to allow them to fit in the circular array.