Abstract
By using the maximum likelihood estimation, surface current distribution on a metal surface is estimated from magnetic fields measured near the metal surface. As a model source for the magnetic field, the authors made a metallic enclosure of a shape of rectangular paral-lelepiped with a narrow slit on one of its sides. The enclosure contains a loop antenna inside, and the electromagnetic field leaking out from the slit is measured near metallic enclosure to estimate the surface current distribution on it. The estimated surface current is found to be largest where the electromagnetic field is thought to be leaking out. In this way, it is possible to locate the vital position on the enclosure surface of an electronic equipment where electro-magnetic wave leaks out.
