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.
Benassi F., Fuscaldo W., Negri E., Paolini G., Augello E., Masotti D., et al. (2021). Comparison between Hybrid- and TM-polarized Bessel-Beam Launchers for Wireless Power Transfer in the Radiative Near-field at Millimeter Waves [10.23919/EuMC50147.2022.9784169].
Comparison between Hybrid- and TM-polarized Bessel-Beam Launchers for Wireless Power Transfer in the Radiative Near-field at Millimeter Waves
Benassi F.;Paolini G.;Augello E.;Masotti D.;Costanzo A.
2021
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.
