RF Magnetic Shielding Effects of an Aggregated Plate Constructed from Carbon Tiles

Abstract

The contamination of the environment by electromagnetic pollution has increased with the increased employment of electronic instrumentation. The use of electromagnetic shielding in the radio frequency (RF) region has, therefore, increased in order to improve environmental conditions. It is known that the value of RF magnetic shielding degree SDH for a superimposed plate, constructed from carbon and ferrite plates, does not equal the sum of the individual SDH values of the carbon and ferrite plates. In the present paper, an aggregated carbon plate (46 mm square) is formed, constructed from carbon tiles (9.2 mm length, 9.2 mm width, 2 mm thickness). A compound plate was constructed by the superimposing a ferrite plate over the aggregated carbon plate. It was found that the values of SDH for the compound plate equaled the sum of the SDH values of the aggregated carbon and ferrite plates. Experimental results revealed several characteristics of the compound plate, including for example, the dependence of SDH on radio frequency, and the dependence of SDH on the value of RF output power.