Abstract
The widely used linear or flat adaptive antenna arrays have a drawback that is the non-fixed beamwidth. The width increases, as the beam steering direction moves from the aperture normal to the aperture plane. If it is required the beam steering over a wide range of angles, then it restricts such an array application. This drawback is absent in the circular antenna arrays. Such arrays are attractive for the usage in the communication applications, because they provide 360° beam scanning with the fixed beamwidth. Additionally, the usage of the adaptive signal processing allows these arrays to combat the interferences and it is very important for the communication systems, which share the same frequency band. This paper considers the adaptive antenna arrays with circular antenna placement. The performance of the circular adaptive array, which uses the Recursive Least Squares algorithm, is demonstrated. The simulation confirms the circular array ability to provide the beam steering over a wide range of angles with the fixed beamwidth and to suppress the interferences simultaneously.
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