The knowledge of the current distribution on the ground plane of a Printed Circuit Board (PCB) is important to overcome many electromagnetic compatibility (EMC) problems. In this paper a Method of Moments (MOM) algorithm is used to evaluate the surface current distribution on the ground (GND) plane. In order to consider the effects of GNDplanes to the signal behaviour on transmission lines, infinite planes are often assumed to reduce the calculation time. The comparison of the currents using finite and infinite ground planes shows a significant modification of the coupling to transmission lines placed in the layer above.
SUMMARYThe electromagnetic radiation from electronic systems is formulated in terms of an integral equation for the electric and the equivalent magnetic current density, which is numerically solved by the method of moments. The electromagnetic coupling to conducting thin wires, thin plates, and aperture fitted cabinets is taken into account by appropriate operator equations.In order to solve the integral equation of electrically large conducting structures, suitable basis functions are needed to minimize the computation time. B-spline functions of the second and third degree are used as a basis in the moment method, which lead to a decrease of the computation time.A second way to decrease the computation time is given by the possibility of determining which parts of the structure of a printed circuit board (PCB) have to be considered and which parts can be neglected. Examples show that the influence of near source conducting areas to the radiated emissions is strong. It will be shown that this influence depends on the geometrical symmetry, the shape, and the distance of the scattering body.
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