基于时间反演的近场无线功率传输效率研究

Near-Field Wireless Power Transmission Efficiency Based on Time Reversal Technique

收发天线间的无线功率传输效率(PTE)是表征室内近场微波无线传能(MPT)系统性能的最重要参量之一。时间反演(TR)作为一种高效无线传能技术被用于MPT系统中。为分析基于TR的近场PTE,基于互易定理推导了辐射式MPT场景中PTE的最优解,证明了TR可以实现最高的PTE。同时基于电磁全波仿真技术研究对比了TR在近场无线传能时相较于传统MPT方法如方向图综合法和相位补偿法的优势。理论和仿真表明,TR能够在平面天线阵列的近场区实现最高的PTE。

Power Transmission Efficiency(PTE)between transceiver antennas is one of the most significant parameters to characterize the performance of indoor near-field Microwave Power Transmission(MPT)systems.Time Reversal(TR)has been used in MPT systems as an efficient wireless power transmission technology.In this paper,the optimal solution of PTE is derived based on TR and the reciprocity theorem.At the same time,the advantages of TR over traditional MPT methods such as pattern synthesis and phase compensation methods in near-field wireless power transmission are compared based on electromagnetic full-wave simulation technology.Theory and simulation show that TR can achieve the highest PTE in the near-field region of the antenna.