A study of line source fields transmitted through a 2D circular dielectric radome or a slab

Abstract

In this thesis, far field solutions for the real and complex line sources surrounded by a cylindrical dielectric shell (radonie) are obtained in both E and H polarizations. These far fields for the radoine model are then compared with the ones transmitted through an infinite dielectric slab. The motivation is that as the far field in the main beam direction is concerned, the radome of large radius can be cipproximated by an infinite dielectric slab. It is clear that the fields of the cylindrical shell (radome) is expressed in terms of cylindrical functions whereas for the slab, the fields are given through Sommerfeld integrals. By applying the saddle point integration techniques to the Sommerfeld integrals, the radiated fields of the slab are numerically calculated and compared with the fields of the dielectric shell. The source is taken as a line source, l)ut it can also simulate a beam field l)y the complex source a.|)proach. d'he study gives a better understanding of the reflector antennas covered with di('lectric radomes.