The great majority of wireless devices are used close
to the human head. These changes the antenna performance
compared to free space situation. The human head absorbs an
amount of power from the antenna radiation. In this sense, it is
important not only to increase the robustness of the antenna
performance, but also to reduce the amount of power absorbed
by the human head. A coupled monopole and a PIFA antenna
are evaluated in terms of antenna performance in presence of
the human head. The most significant parameters (SAR,
efficiency and return losses) are obtained at two different
positions of the antenna as a function of the frequency band, to
finally evaluate the impact of the human head to the antenna
performance, and the effect of the antenna on it. Despite both
antennas have a similar efficiency value at Free Space,
monopole antenna has more sensitivity to the interaction with
the human head.Peer ReviewedPostprint (published version
