4 research outputs found
MAC-Oriented Programmable Terahertz PHY via Graphene-based Yagi-Uda Antennas
Graphene is enabling a plethora of applications in a wide range of fields due
to its unique electrical, mechanical, and optical properties. In the realm of
wireless communications, graphene shows great promise for the implementation of
miniaturized and tunable antennas in the terahertz band. These unique
advantages open the door to new reconfigurable antenna structures which, in
turn, enable novel communication protocols at different levels of the stack.
This paper explores both aspects by, first, presenting a terahertz
Yagi-Uda-like antenna concept that achieves reconfiguration both in frequency
and beam direction simultaneously. Then, a programmable antenna controller
design is proposed to expose the reconfigurability to the PHY and MAC layers,
and several examples of its applicability are given. The performance and cost
of the proposed scheme is evaluated through full-wave simulations and
comparative analysis, demonstrating reconfigurability at nanosecond granularity
with overheads below 0.02 mm and 0.2 mW.Comment: Accepted for presentation in IEEE WCNC '1
Terahertz Dielectric Resonator Antenna Coupled to Graphene Plasmonic Dipole
This paper presents an efficient approach for exciting a dielectric resonator
antenna (DRA) in the terahertz frequencies by means of a graphene plasmonic
dipole. Design and analysis are performed in two steps. First, the propagation
properties of hybrid plasmonic onedimensional and two-dimensional structures
are obtained by using transfer matrix theory and the finite-element method. The
coupling amount between the plasmonic graphene mode and the dielectric wave
mode is explored based on different parameters. These results, together with
DRA and plasmonic antenna theory, are then used to design a DRA antenna that
supports the mode at 2.4 THz and achieves a gain (IEEE) of up to
7 dBi and a radiation efficiency of up 70%. This gain is 6.5 dB higher than
that of the graphene dipole alone and achieved with a moderate area overhead,
demonstrating the value of the proposed structure.Comment: Accepted for presentation at EuCAP 201