Bessel-Gauss Beam Launchers for Wireless Power Transfer

• Published in: IEEE Open Journal of Antennas and Propagation Vol. 2; pp. 654 - 663
• Main Authors: Pakovic, Srdan, Zhou, Siyi, Gonzalez-Ovejero, David, Pavone, Santi Concetto, Grbic, Anthony, Ettorre, Mauro
• Format: Journal Article
• Language: English
• Published: IEEE 2021
• Subjects: Apertures; Bessel beams; Bessel–Gauss beams; Coaxial cables; Diffraction; Electromagnetics; Engineering Sciences; Green's function methods; horn antennas; Impedance; non-diffracting beams; Wireless power transfer; Bessel-Gauss beams; wireless power transfer; Bessel beams; horn antennas; non-diffracting beams
• ISSN: 2637-6431; 2637-6431
• DOI: 10.1109/OJAP.2021.3078234

In this work, we study the use of Bessel-Gauss beam launchers for wireless power transfer (WPT) applications. The power transfer efficiency between two radiating apertures is investigated in the radiative near field. A spectral Green's function approach is used to derive the power efficiency under a simultaneous conjugate impedance match. The transverse electromagnetic (TEM) mode of a coaxial cable, as well as Bessel beam (BB) and Bessel-Gauss beam (BGB) field distributions, are considered as aperture distributions. Numerical results demonstrate that a BGB field distribution is the optimal choice for WPT due to its limited spectrum and reduced diffraction of the radiated beam. We synthesized a Bessel-Gauss launcher that exhibits power efficiency exceeding 50% for distances larger than <inline-formula> <tex-math notation="LaTeX">30\lambda </tex-math></inline-formula>. These results show that non-diffracting beams can pave the way toward efficient near-field WPT systems with extended operating ranges.