用于高效无线功率传输的磁偶极子之间的超材料增强耦合
Metamaterial-Enhanced Coupling between Magnetic Dipoles for Efficient Wireless Power Transfer
摘要：
导电线圈之间的非辐射耦合是无线能量传输应用的候选机制。本文提出了一种基于近场超材料超透镜的功率中继系统，并对该系统进行了深入的理论分析。我们使用时间谐波电路形式主义来描述两个线圈连接到外部电路和均匀的介电常数和磁导率的各向异性介质板之间的所有相互作用。线圈的领域中发现的点偶极子近似使用索末菲积分，这是减少到标准的特殊功能，在长波长的限制。我们表明，即使有一个现实的磁损耗角正切的顺序为0.1，与平板的功率传输效率可以是一个数量级大于自由空间效率时，负载电阻超过一定的阈值。我们还发现，线圈之间的超材料所占据的体积可以大大压缩，通过采用具有大的各向异性比的磁导率。
英文摘要：
Non-radiative coupling between conductive coils is a candidate mechanism for wireless energy transfer applications. In this paper, we propose a power relay system based on a near-field metamaterial superlens, and present a thorough theoretical analysis of this system. We use time-harmonic circuit formalism to describe all interactions between two coils attached to external circuits and a slab of anisotropic medium with homogeneous permittivity and permeability. The fields of the coils are found in the point-dipole approximation using Sommerfeld integrals, which are reduced to standard special functions in the long-wavelength limit. We show that, even with a realistic magnetic loss tangent of order 0.1, the power transfer efficiency with the slab can be an order of magnitude greater than free-space efficiency when the load resistance exceeds a certain threshold value. We also find that the volume occupied by the metamaterial between the coils can be greatly compressed by employing magnetic permeability with a large anisotropy ratio.
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