SARs for pocket-mounted mobile telephones at 835 and 1900 MHz

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Increasingly, mobile telephones are becoming pocket-sized and are being left in

the shirt pocket with a connection to the ear for hands-free operation. We have

considered an anatomic model of the chest and a planar phantom recommended

by US FCC to compare the peak 1 and 10 g SARs for four typical cellular

telephones, two each at 835 and 1900 MHz. An agreement within

±10% is obtained between calculated and experimental 1 and 10 g SARs for various

separations (2–8 mm) from the planar phantom used to represent different

thicknesses of the clothing both for the antenna away from or turned back

towards the body. Because of the closer placement of the antennas relative to

the body, the peak 1 and 10 g SARs are considerably higher (by a factor of

2–7) for pocket-mounted telephones as compared to the SARs obtained using

a 6 mm thick plastic ear head model—a procedure presently accepted both in

the US and Europe. This implies that a telephone tested for SAR compliance

against the model of the head may be severely out of compliance if it were

placed in the shirt pocket.

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