Power transmission for NFC

What is it about?

Wireless energy transmission is a key element in Contactless HF Communication Technologies, such as Radio Frequency Identification (RFID) or Near Field Communication (NFC). This power aspect differentiates the technology from conventional wireless communication. We 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. We 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 our model is used to solve a practical problem of two coupled spiral antennas, where we consider our contribution in terms of NFC.

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Why is it important?

The contribution is unique in that it uses Maxwell's equations from an 1891 edition of his "Treatise (Vol. 1)" before we became conditions to only use the Heaviside truncation, wherein, descriptions of field potentials are absent from the problem-space. In doing so, we have accounted for "extra" power not represented in truncated expressions. This becomes extremely important for wireless power systems as they decrease in size requiring micro, nano, or pico-sized sources of power.

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