Abstract
Wireless energy transmission is a key element in Contactless HF Communication Technologies, such as radio frequency identification or near field communication (NFC). This power aspect differentiates the technology from conventional wireless communication. The authors consider the circuit model as a lumped-element description with a coupled-transformer field model to formulate a representation of the problem and include the orientation of the magnetic field in planar space. The authors propose a novel computational model to reveal the dynamics of energy transfer can be represented as a set of forces projected by the oscillator at the interface of free-space. Finally, a high-frequency finite-element simulation based on the authors' model is used to solve a practical problem of two coupled elliptical spiral-loop antennas of a credit-card size, where the authors consider their contribution in the context of NFC.
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