Miniature Coil for Wireless Power and Data Transfer through Aluminum

Abstract

This paper presents the design and development of miniature coils for wireless power and data transfer through metal. Our coil has a total size of 15 mm × 13 mm × 6 mm. Experimental results demonstrate that we can harvest 440 mW through a 1 mm-thick aluminum plate. Aluminum and stainless-steel barriers of different thicknesses were used to characterize coil performance. Using a pair of the designed coils, we have developed a through-metal communication system to successfully transfer data through a 1 mm-thick aluminum plate. A maximum data rate of 100 bps was achieved using only harvested power. To the best of our knowledge, this is the first report that demonstrates power and data transfer through aluminum using miniature coils.

Analysis of the Magnetic Field Magnetoinductive Wave Characteristics of a Wireless Power Transfer System

“…The analysis and calculation of the electromagnetic field of WPT systems has received considerable attention from researchers. Previous research includes analyses on magnetic field calculation methods [5][6][7], calculations of magnetic fields to optimize the system parameters [8], electromagnetic field evaluation [9], and coils and shielding design [10][11][12][13].…”

“…Figure13. Velocities of the peak points of B 1 (z, t), B 2 (z, t), and B 3 (z, t) varying with the time degrees.…”