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Beam scanning properties of circular array of anisotropic cylinders

Eggimann [1] has suggested that a circular array of ferrite cylinders surrounding an electric line source might shift its main lobe by varying the applied magnetic field. Later, Okamoto [2] presented a numerical method for solving the two dimensional problem of scattering by multiple gyrotropic cylinders. He then showed by numerical results the possibility of beam scanning by a circular array of plasma cylinders [3]. He also designed and investigated the performance of a scanning antenna using ferrite rods [4]. He found that the pattern of this antenna has a beam with suppressed sidelobes. However, in Okamoto's work the main lobe could be rotated only at intervals of about 30° by gradually changing the axial magnetic field applied to the respective ferrites, and, a continuous scanning could not be achieved.