Effect of Shielding with Electromagnetic Absorbing Materials on Specific Absorption Rate Reduction

Abstract

In this paper, a new specific absorption rate reduction technique is introduced. The shielding technique is performed by different electromagnetic absorbing materials. Electromagnetic absorbers used in shielding are glass, FR-4, teflon, Nickel, Gallium Arsenide and Silicon. Specific absorption rate reduction factor of 48.38% averaged over 1 gm of mass is achieved. The infinity-shaped structure is a new metamaterial structure which is used in shielding. The infinity-shaped structure achieves specific absorption rate reduction factor of 53.8% averaged over 1 gm of mass tissue. The standard anthropomorphic mannequin phantom human head model at 900 MHz is presented. Specific absorption rate distribution and radiation pattern are analyzed, as well, to verify the performance of the model and the antenna. Simulations show the effect of changing the thickness and the width of the shield on the specific absorption rate value.