Modelling radiation from complex structures using a hybrid FDTD-BIE technique

A new hybrid finite-difference time-domain-boundary integral equation technique is proposed to model the radiation of complex three-dimensional structures involving current sources in the presence of metallic and dielectric objects. The simulation geometry is decomposed into several subregions. For homogeneous bounded and unbounded regions the 3D boundary integral technique is used. For each inhomogeneous subregion an interaction matrix is calculated at multiple frequencies using FDTD. Finally the different interaction matrices and source vectors are assembled into one global matrix equation by invoking continuity of the tangential electric and magnetic fields at all the interfaces between the subregions. An example is given to validate the new method.