Biconical antenna with inhomogeneous dielectric lens for UWB applications

Abstract

The improvement of the ultra-wideband (UWB) biconical antenna directional characteristics at the upper part of the bandwidth by filling the aperture with the inhomogeneous dielectric lens is discussed in this Letter. The inhomogeneity of the filling was achieved by the complex three-dimensional configuration of the air gaps and the dielectric with constant permittivity. The distribution law of permittivity in the aperture was obtained in the geometrical optics approximation using the law of Lihtenekker for finely dispersed composition of substances with different dielectric constants. The numerical simulations and the experimental measurements of the biconical antenna characteristics have been carried out and the results are presented. The application of the proposed method allows to reduce the level of lateral radiation and to increase the antenna gain and bandwidth. The technique for the lens manufacturing by using 3D printing technologies is presented.

Design of wideband receiving antenna for VHF / UHF band passive radar

“…16 Generally, the lower limit of the working frequency band can be expanded by increasing the antenna height, but it will cause the stability of the antenna pattern in the working frequency band to deteriorate and hence affects the receiving of multiband signals. There are many methods reported to increase working bandwidth and reduce antenna size of the biconical antenna, [17][18][19][20][21] but these methods cannot simultaneously achieve large working bandwidth and good pattern consistency in the working frequency band.…”