Shielding Performance of Metallic Cylinders

Electrical and electronic equipment must often be protected against external interference. Accordingly, metal shields are used against microwave radiation, electromagnetic effects, etc. Conducting materials, impregnated with elastic substances, are also used in many cases. The present paper deals with the performance of such a cylindrical shield, including a reference to shielding effectiveness. It is shown that with the assumed model the shield is pervious along its axis over a spectrum of frequencies.