Broadband circuit model for electromagnetic-interference analysis in cavities

The electrical behavior of a cavity with arbitrary shape, lossy walls and lossy filling material, which is excited by electrically small current elements, is represented by a novel broadband Foster-type circuit based on the eigenmodes of the cavity. This model is inherently stable in the time domain and allows the simulation of arbitrary nonlinear loads with a commercial circuit simulator. The convergence of the circuit model is accelerated by the extraction of quasi-static inductances and capacitances. The presented model is validated in the frequency and time domain.