  We review the use of graphene to develop reconfigurable, miniaturized, and
efficient terahertz (THz) antennas and associated feeding networks, and attempt
to identify current research trends and mid- and long-term challenges and
prospects. We first discuss the state of the art in resonant, leaky-wave and
reflectarray antennas, providing a critical assessment of their performance,
limitations, and main challenges that remain to be addressed. Next, we examine
different integrated feeding networks, including components such as switches,
filters, and phase shifters, and we clarify the impact that graphene's
intrinsic spatial dispersion may have in their performance. Our outlook clearly
describes how graphene can bring exotic functionalities to all these devices,
including quasi real-time reconfiguration capabilities and magnet-less
non-reciprocal responses. Some exciting applications of THz antennas are then
presented and discussed, including transceivers, biosensors, and first
experimental realizations of detectors and modulators. We conclude by outlining
our vision for the promising future of graphene-based THz antennas.
