Absorption Related to Hand-Held Devices in Data Mode

The human body has an influence on the radiation
from handheld devices like smartphones, tablets and laptops,
part of the energy is absorbed and the spatial distribution of the
radiated part is modified. Previous studies of whole body absorp-
tion have mainly been numerical or related to talk mode. In the
present paper an experimental study involving four volunteers
and three different devices is performed from 0.5 to 3 GHz. The
devices are a laptop, a tablet, and a smartphone all held in the
lap. The 3D distribution of radiation is measured. Comparing
the integrated power in the case of a person present with the
device alone allows the determination of the relative absorption
in the whole body and the device. In general the absorption varies
considerably between devices and as a function of frequency and
person. The absorption varies from almost nothing to close to
100%. The shadowing of the body is apparent in all cases. The
losses in the inbuilt antennas are often dominating and with a
maximum total loss of 99% for the smartphone for one user. The
absorption in the body is around 50%.