Analytical analysis of antennas in the presence of a multilayered dielectric sphere with application to hand held terminals

The problem of a herzian dipole in the presence of a dielectric sphere is solved by expanding the electromagnetic field in the vector spherical harmonics and imposing the appropriate boundary conditions. The solution is generalized to a N-layered sphere. The algorithm is programmed as the RAME (Radiation Analysis by Multipole Expansion) code by means of Matlab. Specific choice of the location of the dipole gives short computation time. The output includes near-and far-field plots and efficiency. The results have been compared with static solutions when applicable and good agreement was found. The analysis is extended to the arc antenna which is otherwise only numerically solvable. The theory of RAME is presented, followed by results for testing the program. Finally RAME results relevant to personal communications are presented.