Effect of hands free kit on SAR when using a Smart phone at 1800MHz

This paper investigates the effects of a wired Hands free kit on the SAR inside the head when using a Smart phone in front of the face. SAR measurements are carried out in the GSM 1800 frequency band using a DASY twin phantom and the Loughborough phantom. Results indicate that energy is coupled onto the wire in certain scenarios and this can increase the SAR at the ear when the Smart phone is in front of the face. However, all results indicate that the maximum SAR in the head is obtained when the Smart phone is used in its standard talk position at the side of the head.