Abstract
In this paper, we investigate the electromagnetic response of a Huygens’ metasurface (HMS) embedded between the transmitter and receiver coils of a near field wireless power transfer (WPT) system and their interactions for the feasibility of increasing efficiency. To analyze the proposed configuration, we use the point-dipole approximation to describe the electromagnetic fields and boundary conditions governing HMS to calculate the mutual inductance between the coils and to obtain closed-form analytical expressions. The proposed theory shows that by optimally designing the HMS inclusions, the amplitude of the mutual inductance between the transmitter and receiver coils in the near-field WPT can be increased, resulting in improved efficiency. Finally, by drawing on the proposed theory, we design a thin layer and finite-size HMS consisting of 64 elements. The bianisotropic Omega-type particle is used to design the HMS to improve the efficiency of the sample WPT system at the frequency of 100 MHz. The results of the full-wave simulation show that the power transfer efficiency in the free space increases from 25% to 42% in the presence of the proposed HMS.
Highlights
B Y expanding electrical appliances and increasing their fundamental role in everyday human life, the energy supply of these devices is one of the most critical challenges
As shown in the figure, the power transfer efficiency is increased from 25% in the conventional mode to 42% in the Huygens’ metasurface (HMS)-assisted wireless power transfer (WPT)
We have presented a rigorous analysis to describe the electromagnetic fields of the constitutive coils of an HMSbased WPT
Summary
B Y expanding electrical appliances and increasing their fundamental role in everyday human life, the energy supply of these devices is one of the most critical challenges. In our recent paper [42], we have investigated the possibility of improving efficiency in non-radiative WPT using a metasurface embedded between two varying current coils based on a point-dipole approximation to achieve a closed-form expression for mutual impedance. Using electromagnetic wave theory and HMS analytical models, the proposed modeled WPT can be analyzed and the closed-form expressions for mutual inductance between magnetic dipoles and power transfer efficiency can be obtained. To analyze the effect of HMS on the performance of the WPT system using the point-dipole approximation, the electromagnetic fields in the presence of HMS can be calculated to obtain an analytical and closedform expression for mutual induction between coils. To investigate the effect of HMS on the performance of the WPT system and find the mutual inductance between the dipoles, we use the boundary conditions governing the metasurface. Where L(111) is defined as the HMS contribution to selfinductance of the transmitter coil and L(101) is the selfinductance of the dipole without HMS
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