Bessel beams can be generated at millimeter waves by means of compact devices by exciting a TM leaky mode in a resonant Fabry–Perot cavity through a simple coaxial feeder. Recently, a loop-antenna feeder has been proposed to excite a TE leaky mode. In this work, we investigate the radiative near-field coupling of two launchers of the same kind at around 30 GHz, using two different feeding systems. Interestingly, the full-wave field analysis proposed here reveals that coaxial cables allow for having a pure TM Bessel beam, whereas loop antennas excite a hybrid mode. Analytical procedures for a simple design workflow are presented assuming ideal feeding systems. Numerical validations and a rigorous evaluation of the link budget is instead proposed for a more realistic case. Finally, a rectifier is connected to the receiver Bessel-beam launcher and the estimation of the RF-to-DC efficiency is provided for several TX-RX distances. These results demonstrate the feasibility of this technology for mm-wave WPT.
Comparison between Hybrid-and TM-polarized Bessel-Beam Launchers for Wireless Power Transfer in the Radiative Near-field at Millimeter Waves / Benassi, Francesca; Fuscaldo, Walter; Negri, Edoardo; Paolini, Giacomo; Augello, Elisa; Masotti, Diego; Burghignoli, Paolo; Galli, Alessandro; Costanzo, Alessandra. - (2022). (Intervento presentato al convegno 51st European Microwave Conference, EuMC 2021 tenutosi a London; United Kingdom).
Comparison between Hybrid-and TM-polarized Bessel-Beam Launchers for Wireless Power Transfer in the Radiative Near-field at Millimeter Waves
Fuscaldo, Walter;Negri, Edoardo;Burghignoli, Paolo;Galli, Alessandro;
2022
Abstract
Bessel beams can be generated at millimeter waves by means of compact devices by exciting a TM leaky mode in a resonant Fabry–Perot cavity through a simple coaxial feeder. Recently, a loop-antenna feeder has been proposed to excite a TE leaky mode. In this work, we investigate the radiative near-field coupling of two launchers of the same kind at around 30 GHz, using two different feeding systems. Interestingly, the full-wave field analysis proposed here reveals that coaxial cables allow for having a pure TM Bessel beam, whereas loop antennas excite a hybrid mode. Analytical procedures for a simple design workflow are presented assuming ideal feeding systems. Numerical validations and a rigorous evaluation of the link budget is instead proposed for a more realistic case. Finally, a rectifier is connected to the receiver Bessel-beam launcher and the estimation of the RF-to-DC efficiency is provided for several TX-RX distances. These results demonstrate the feasibility of this technology for mm-wave WPT.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
