Biconical Antenna With Anisotropic Dielectric Lens for the Antenna Pattern Side Lobes Reduction

The paper describes a method for calculating an anisotropic dielectric lens designed to reduce the side lobes level (SLL) of the biconical antenna radiation pattern. The technique is based on the assumption that the level of side radiation of a biconical antenna depends on the shape of the wavefront emitted by the aperture. An analytical formula for the law of dielectric filling is obtained. This approach forms an elliptically concave wave front and witch shape can be chosen using an adjustable parameter. A study was made of the dependence of side lobes level on this parameter. It is shown that such a lens structure makes it possible to reduce the level of side radiation by more than 15 dB relative to an antenna without a lens.