NOVEL TRIANGULAR METAMATERIAL DESIGN FOR ELECTROMAGNETIC ABSORPTION REDUCTION IN HUMAN HEAD

Abstract

In this paper, a novel triangular metamaterial (TMM) structure, which exhibits a resounding electric response at microwave frequency, is developed by etching two concentric triangular rings of conducting materials. A flnite-difierence time-domain method in conjunction with the lossy-Drude model was used in this study. Simulations were performed using the CST Microwave Studio R ∞ . The technique of speciflc absorption rate (SAR) reduction is discussed, and the efiects of the position of attachment, the distance, and the size of the metamaterials on the SAR reduction are explored. The performance of the novel TMMs in cellular phones was also measured in the cheek and the tilted positions using the COMOSAR system. The TMMs achieved a 50.82% reduction for 1gm SAR. These results provide a guideline to determine the triangular design of metamaterials with the maximum SAR reducing efiect for a cellular phone.