NUMERICAL ANALYSIS OF DIVERSITY ANTENNA SYSTEMS FOR HAND-HELD COMMUNICATION DEVICES

摘要

The formidable task of antenna operation within a multipath environment is often combated by utilizing multiple diversity antennas with independent spatial distributions and polarizations. The benefit of additional antennas is measured by the correlation between the diversity channels. With the aid of a simplified multipath model, the correlation can be directly related to real physical parameters of the antenna system. Specifically, the correlation coefficient is related to the far field pattern of the radiating antenna system. The Finite Difference Time Domain (FDTD) and Method of Moments (MOM) numerical methods can model the diversity antennas mounted upon a portable hand-set and generate the far field pattern. Analysis of various antennas configurations will illustrate the affect on diversity system performance in a multipath environment.