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SAR Reduction in Human Head from Mobile Phone Radiation using Single Negative Metamaterials

In this paper, we use single negative metamaterials to reduce the electromagnetic interaction between the mobile phone and human head. The specific absorption rate (SAR) in the head can be reduced by placing the metamaterials between the antenna and the head. We design the single negative metamaterials from periodic arrangement of split ring resonators (SRRs), spiral resonators (SRs) and open split ring resonators (OSRRs). By properly designing structural parameters of SRRs, the effective medium parameter can be trade negative around 900 MHz and 1800 MHz bands. The design procedure and principle operation of resonators are explained. The performance and size comparison of resonators will be described. Numerical results of the SAR values in the human head with the presence of resonators exhibit SAR reduction. These results can provide useful information in designing safety mobile communication equipments compliant.