Mutual coupling between two wires of different length and finite conductivity

The effect of electromagnetic fields on human beings is a growing concern. Especially the possible health hazards of using mobile communication devices such as hand-held telephones is an increasing topic of attention. One of the ways to examine these effects is to compute the electromagnetic field distribution in the human body that is exposed. Mutual coupling between the antenna wire structure and the human body has to be taken into account in most cases. We present the results of a pilot study in which we solve the mutual coupling between two wires of arbitrary length and finite conductivity. The coupling problem is solved in terms of an integral equation in the temporal Laplace domain. This integral equation in its strong form is weakened such that the spatial derivatives are integrated analytically. The integral equation is solved numerically by using the conjugate-gradient FFT method. Further, an appropriate weakened form of the Green´s function is presented. It is noted that both the wires are non-perfectly conducting. The complete system of two wires is excited by applying a /spl delta/-gap voltage excitation on one of them. Numerical computations have been carried out for different test geometries.