Effect of the rim presence on the characteristics of inhomogeneous dielectric lens antennas

Authors: Aleksandrin A. M., Salomatov Yu. P.

Annotation: The article considers the effect of the presence of a dielectric rim on the characteristics of inhomogeneous dielectric lens antennas. The rim is a hollow cylinder covering the side surface of the lens. It was shown that the rim influences the aperture efficiency of the lens antenna, which comes out in a periodic dependence of the aperture efficiency on the width of the rim (the difference between the inner and outer radii of the cylinder). The values of the widths of the rim are obtained at which the aperture efficiency keeps the value equal to aperture efficiency of the lens without the rim. It was found that these values do not depend on the radius or the permittivity of the lens, but depend only on the permittivity of the rim material, and this relationship has a hyperbolic character.

Keywords: lens antennas, inhomogeneous dielectric