Tunable THz antennas based on a single unpatterned graphene sheet placed inside a grounded dielectric multilayer are studied with the aim of characterizing their performance in terms of pattern reconfigurability, directivity, and radiation efficiency. The considered structures belong to the class of Fabry-Perot cavity (FPC) antennas, whose radiation mechanism relies on the excitation of cylindrical leaky waves with an ordinary (i.e., non-plasmonic) sinusoidal transverse modal profile. This allows for achieving radiation efficiencies considerably higher than those of alternative graphene-based radiators based on the excitation of surface-plasmon polaritons (SPPs) either in bound or leaky propagation regimes. A customized efficient circuit model has been employed in order to obtain all the radiation characteristics of such graphene FPC antennas, which have been also fully validated by means of a CAD tool. The role of the graphene quality is explicitly taken into account in this comprehensive investigation, proving that it plays a remarkable role in establishing the antenna performance. In particular, it is expected that the standard quality of graphene allows for designing low-efficiency reconfigurable THz antennas based on SPPs and, conversely, high-efficiency FPC antennas with slightly reduced reconfigurability.

Fuscaldo, W., Burghignoli, P., Baccarelli, P., Galli, A. (2017). Graphene Fabry–Perot Cavity Leaky-Wave Antennas: Plasmonic Versus Nonplasmonic Solutions. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 65(4), 1651-1660 [10.1109/TAP.2017.2670520].

Graphene Fabry–Perot Cavity Leaky-Wave Antennas: Plasmonic Versus Nonplasmonic Solutions

BACCARELLI, PAOLO;
2017-01-01

Abstract

Tunable THz antennas based on a single unpatterned graphene sheet placed inside a grounded dielectric multilayer are studied with the aim of characterizing their performance in terms of pattern reconfigurability, directivity, and radiation efficiency. The considered structures belong to the class of Fabry-Perot cavity (FPC) antennas, whose radiation mechanism relies on the excitation of cylindrical leaky waves with an ordinary (i.e., non-plasmonic) sinusoidal transverse modal profile. This allows for achieving radiation efficiencies considerably higher than those of alternative graphene-based radiators based on the excitation of surface-plasmon polaritons (SPPs) either in bound or leaky propagation regimes. A customized efficient circuit model has been employed in order to obtain all the radiation characteristics of such graphene FPC antennas, which have been also fully validated by means of a CAD tool. The role of the graphene quality is explicitly taken into account in this comprehensive investigation, proving that it plays a remarkable role in establishing the antenna performance. In particular, it is expected that the standard quality of graphene allows for designing low-efficiency reconfigurable THz antennas based on SPPs and, conversely, high-efficiency FPC antennas with slightly reduced reconfigurability.
Fuscaldo, W., Burghignoli, P., Baccarelli, P., Galli, A. (2017). Graphene Fabry–Perot Cavity Leaky-Wave Antennas: Plasmonic Versus Nonplasmonic Solutions. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 65(4), 1651-1660 [10.1109/TAP.2017.2670520].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/327787
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