Effects of metallic semi-rimmed spectacles on SAR in the head from a 900MHz frontal dipole source

This paper examines the effects of metallic semi-rimmed spectacles on the specific absorption rate (SAR) inside the head when illuminated by a frontal dipole source representing a PDA held in front of the face. The frequency considered is 900 MHz. Both children´s and adult´s spectacles are investigated using the Loughborough SAM (Specific Anthropomorphic Mannequin) head incorporated into a DASY4 robot measurement system. The spectacles are tested with and without their arms. For comparison, simulations of the SAM head using FDTD have been conducted. Results show children´s semi-rimmed spectacles may be resonant at 900 MHz and may have a focusing effect that redistributes the SAR in the head.