Influence of shielded enclosure's apertures on shield effectiveness at GHz band

摘要

While the apparatus using radio, such as a cellular phone, spreads quickly, the voltage of a circuit tends to fall by the downsizing, weight saving and power-saving of an electric device. Such a tendency occasions the interference problem more seriously. We studied the relation of the shield effectiveness and the apertures for the purpose of heat dissipation or other. And estimated the empirical formula which computes the shield effect with a hole diameter and the quantity of holes, at the frequency of 1.3GHz - 2GHz. The shield effect of the shield enclosure, which has some apertures, can be predicted, and the electromagnetic immunity margin of apparatus can be grasped beforehand.