On the Evaluation of the Shielding Effectiveness of an Electrically Large Enclosure

The shielding effectiveness (SE) has become a fundamental step in testing active or passive electric devices. The Reverberating Chamber (RC) is a well- established method for determining the SE since has the advantage to expose the material to a more realistic environment. In this paper the SEe of electrically large enclosures with a metallic mesh grid in a RC is evaluated. Enclosures made with metallic mesh are considered. In particular, it is shown that the SE of a material is unable to provide complete information for the SEe of an electrically large enclosure made with the same material. Moreover, this latter one is related to the loading conditions within the enclosure itself. Measurements accomplished at RC of the Università di Napoli Parthenope (formerly Istituto Universitario Navale, IUN) confirm the physical soundness of the proposed approach

Measurements on the reflectivity of materials in a Reverberating Chamber

The experimental validation is an important step in any measurement procedures development. In this paper, according to the absorber method, a meaningful set of experimental results for the evaluation of the reflectivity of materials in a Reverberating Chamber (RC) is shown in order to validate the attendant measurement procedure. Measurements on a frequency range between 1 to 18 GHz have been successfully accomplished on four different shields of metallic mesh grid shape. Further, enhancements to increase the measurement dynamic have been also discussed. Results show that the procedure is able to simply evaluate metallic mesh grid reflectivity that can be used in designing shields to be incorporate into the wall structure of buildings for realizing the desired electromagnetic isolation of real-life environments