Simulating Axisymmetrically Excited Resistive and Thin-Dielectric Disk Antennas with Increased Efficiency and Bandwidth

The radiation of circular-disk resistive microstrip antennas and thin circular-disk dielectric antennas axisymmetrically excited by a vertical electrical dipole is considered. The generalized boundary conditions are used to characterize electromagnetic properties of imperfect disks. The problems are considered in the Hankel transform domain and reduced to infinite matrix equations of the Fredholm second kind, by applying systematically the method of analytical regularization combined with Galerkin´s method. A detail numerical analysis of fundamental wave phenomena caused by the partial transparency and losses in the disk material is carried out. Optimal antennas, in the sense of increased radiation efficiency and frequency bandwidth, are found with an account of surface waves, disk absorption, and its partial transparency.