This section discusses a type of antenna that is mounted on the tag rather than
one connected to an interrogator. The antenna is the largest part of the tag and is
connected to the tag IC. The antenna receives the signals from the interrogator
and, depending on tag type, it either transmits or reflects the received signal
back. For active tags, it transmits the signals, and for semi-passive and passive
tags, it reflects the signals. For passive tags, the antenna also collects power from
the radio waves and supplies it to the IC.