Design of shielding enclosure to protect security devices

Currently, electromagnetic interference poses a threat to all electrical and electronic devices, especially for security devices where reliability represents the key factor. The shielding of security devices is not sufficiently resistant in terms of electromagnetic immunity because devices consist mainly of plastic material, except control panels which are equipped with a simple metallic shield with holes. The components leading to the central unit are also potential vulnerabilities for the system. The paper described here is focused on a design of shielding box regarding electromagnetic susceptibility using CST Studio Suite simulation software which is useful to determine the vulnerabilities of design. Shielding enclosure should be able to resist to effects of electromagnetic interference acting against the security device in the electromagnetic environment, and at the same time, the box should be able to protect vicinity of the device against an effect of disturbance from the enclosure interior. The paper should investigate with the level and layout of the electromagnetic field inside the shielding enclosure composed of different kinds of material because it can be different in individual areas of the interior. Therefore, the position of the probe working in the x, y, and z axes should be changed depending on the location of the radiation source in this case wave plane. The purpose of the paper described here is to create and describe a simple design of shielding box for security device using suitable shielding materials and CST simulation software. The knowledge described in the paper will help to improve the current state of security devices.