FINITE-DIFFERENCE TIME-DOMAIN METHOD FOR ELECTROMAGNETIC-RADIATION, INTERFERENCE, AND INTERACTION WITH COMPLEX STRUCTURES

In this paper the finite-difference time-domain (FDTD) method is reviewed and then used to model and predict the radiation patterns of a monopole antenna mounted on the bottom of a perfectly conducting helicopter structure. The computed radiation patterns are compared with measurements demonstrating the accuracy of the FDTD method. To study the effect of antenna interference, a second monopole antenna is mounted on the structure and the patterns are recalculated. The perfectly conducting helicopter model is then replaced by a partially composite/partially conducting material structure and the electromagnetic fields penetrating the structure from an incident plane wave are analyzed. A preprocessing geometry program used in generating an FDTD geometry model by using a solid surface helicopter structure is presented.