Abstract: An electromagnetic test method simulates the effects of plane electromagnetic wave illumination on a conducting body. A conductive sheet is placed in the vicinity of the body and connected to an electrical ground. Alternating current from a current generator is injected into the conducting body via electrodes positioned at spatially separated points on the body's surface. The fields generated by the injected currents and the mirror currents in the grounded conducting sheet induce fields which create an overall current distribution in the conducting body substantially identical with that resulting from the incidence of a plane electromagnetic wave upon the body.