access icon free Inhomogeneous electromagnetic metamaterial design method for improving efficiency and range of wireless power transfer

© The Institution of Engineering and Technology
Received 22/03/2019, Accepted 07/06/2019, Revised 19/05/2019, Published 10/06/2019

In the past few years, the limitation of homogeneous electromagnetic metamaterial (EMMM) in magnetic field modulation had been proved by many researches. The introduction of inhomogeneous EMMM (IEMMM) provided a significant progress in improving the range and efficiency of the wireless power transfer system (WPTS). An IEMMM with three kinds of effective permeability came up here. By analysing the effective permeability characteristics of the circular, square, and ‘8’-shaped coil unit cell and the modulated regulation of magnetic field by negative permeability medium, a two-dimensional IEMMM with combinations of square and ‘8’-shaped coil unit cell were studied. The finite element simulation results of WPTS with IEMMM proved an improvement in magnetic field modulation and flux leakage control. In the WPTS, the designed IEMMM is able to improve the power transmission efficiency by up to 28%.

Inspec keywords: inductive power transmission; metamaterials; permeability; magnetic fields; electromagnetic metamaterials; coils; finite element analysis; magnetic permeability

Other keywords: effective permeability characteristics; WPTS; power transmission efficiency; magnetic field modulation; inhomogeneous electromagnetic metamaterial design method; designed IEMMM; two-dimensional IEMMM; significant progress; shaped coil unit cell; homogeneous electromagnetic metamaterial; finite element simulation results; modulated regulation; wireless power transfer system; negative permeability medium; inhomogeneous EMMM; range

Subjects: Wireless power transmission; Numerical approximation and analysis; Numerical analysis; Microwave materials and structures; Optimisation techniques; Finite element analysis

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