Design and analysis of a SRR superstrate for SAR reduction

Abstract

This paper focuses on the design and analysis of a split-ring resonator (SRR) superstrate for a patch antenna, operating in the 1.75 GHz band, in view of reducing the specific absorption rate (SAR). The power radiation from the antenna with and without the superstrate is discussed. Transmission spectra of the SRR are retrieved using the classic waveguide theory approach. Higher order stop band of the superstrate around 1.75 GHz is responsible for the reduction in the electromagnetic absorption. SAR is measured for various layers of the human head such as skin, fat, bone, dura, CSF and brain individually. It is inferred that the superstrate is capable of obtaining at most 86% of SAR_10g reduction with promising antenna performances. The conventional patch antenna along with the SRR superstrate is fabricated and measured to validate the simulation results.

Keywords:

• SAR
• SRR superstrate
• patch antenna
• tissue model
• stop band

Disclosure statement

No potential conflict of interest was reported by the authors.