  For in-building networks, the potential of transparent antennas, which are
used as windows of a building, is presented in this paper. In this scenario, a
transparent window antenna communicates with outdoor devices or base stations,
and the indoor repeaters act as relay stations of the transparent window
antenna for indoor devices. At indoor, back lobe waves of the transparent
window antenna are defined as interference to in-building networks. Hence, we
analyze different SIR and SINR results according to the location of an indoor
repeater through 3D ray tracing system-level simulation. Furthermore, a
link-level simulation through a full-duplex software-defined radio platform
with the fabricated transparent antenna is presented to examine the feasibility
of the transparent antenna.
