Mechanism of Two Resonant Modes for Highly Resonant Wireless Power Transfer and Specific Absorption Rate

Abstract

Abstract-In this work, the dosimetry for two resonant modes of a highly resonant wireless power transfer (HR-WPT) system is investigated, and the results are compared. The physical mechanism of the two resonant modes, which occur when the two transmitting and receiving resonators are extremely close to one another, is presented with the simulated results and the equivalent circuit models for the HR-WPT system. The difference between the two resonant modes for the specific absorption rate induced in the head model is discussed by comparing the electromagnetic fields for each mode. Furthermore, the dosimetry for the four-coil HR-WPT system is also investigated under the conditions of a single resonant mode and two resonant modes. The specific absorption rates (SARs) are calculated with head-size and body-size simplified human models at various distances from the WPT system and in each mode. The electric and magnetic fields of the odd mode show stronger distribution than those of the even mode in the area near to the WPT system, while the opposite results are found in the area farther away.

Diffraction Radiation Oscillator With Frequency Tuning on Mutual Coupled Modes in an Open Resonant System

“…At the intersection or approaching of the dispersion curves for operating and higher-order modes, the decrease of an output power of DRO occurs, and even there is a failure of an oscillation as a result of a mutual coupling of the ORS modes [4,5]. However, there are a lot of successful applications of mutual coupled modes in RF/microwave devices, such as narrow-band bandpass filters for mobile communications systems [6], highly resonant wireless power transfer adapters [7], etc.…”