  In this opening presentation we will first recall the main characteristics of
graphene conductivity and electromagnetic wave propagation on graphene-based
structures. Based on these observations and different graphene antenna
simulations from microwave to Terahertz, we will discuss the issue of antenna
efficiency, integration and reconfigurability, as function of the operation
frequency range. While the applicability of graphene for antennas at microwave
appears limited to particular cases where very low efficiency can be tolerated
for integration or transparency purpose, the plasmonic nature of graphene
conductivity at terahertz frequency allows unprecedented antenna properties and
in particular efficient dynamic reconfiguration.
