Abstract
In order to enhance the transmission efficiency of wireless power transfer (WPT), a negative permeability metamaterials (NPM) with a structure of honeycomb composed by units of hexagon-shaped spirals copper is proposed in this paper. The unit parameters of the NPM are optimized, to make sure the negative permeability at the special frequency. The S-parameters of the designed NPM are measured by a network analyzer and the permeability is extracted, it shows the honeycomb NPM has a negative permeability at 6.43 MHz. A two-coil WPT is setup and the transmission efficiency of WPT embedded with NPM at the different position and with different structure are investigated. The measured results show that the 2-slab honeycomb NPM have a good perform compared with the 1-slab NPM, and the efficiency can be increased up to 51%. The results show that honeycomb NPM embedded in the WPT help to improve the transmission efficiency remarkable.
Highlights
In recent years, Wireless power transfer (WPT) is widely used in many application, such as electric vehicles, portable electronics and implanted medical devices
For these types of WPT, the transfer efficiency will drop dramatically as the distances between the transfer and receiver are larger than the coil diameters
Compared to the WPT without negative permeability metamaterials (NPM), the transmission efficiency is improved from 17% to 47% when using the NPM planes composed by 6×6 units.[4]
Summary
Wireless power transfer (WPT) is widely used in many application, such as electric vehicles, portable electronics and implanted medical devices. Inductive coupling and magnetic resonance are the two major WPT technologies, they are suitable for short-range and mid-range, respectively. For these types of WPT, the transfer efficiency will drop dramatically as the distances between the transfer and receiver are larger than the coil diameters. 6.78 MHz, which is the industrial, scientific and medical (ISM) radio band Joungho Kim suggest using the NPM to concentrate the magnetic fields between the transfer and receive coils, in the research, they designed and fabricated a thin NPM using a 1.6mm dual layer printed circuit board with a high dielectric constant substrate to achieve a negative relative permeability, their experiments demonstrated a 44.2% efficiency improvement.[8]. Based on the NPM, a corresponding WPT is established and efficiency performance of WPT with 1-slab and 2-slab NPM are investigated
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