Influence of the finite conductivity on RLSA antenna design

In this paper, we consider the effect of the finite conductivity on the design of a radial line slot array (RLSA). Such an effect can be not negligible at high frequencies, especially when low cost metallization techniques are adopted. We show how this effect can be easily introduced in the numerical modeling of the antenna. As a matter of the fact, we extend the analytical evaluation of the dyadic admittance Green's function to the case of a low, arbitrary impedance surface, and we use it within a Method of Moment (MoM) for RLSA. The results of the MoM numerical simulations have been tested against those by commercial codes for different conductivity values.