High Efficiency WPT System Using Hybrid Metasurface and Reactive Impedance Surface

在2022财年，提出了一种新的级联结构，以改善耦合KQ乘积(其中K表示耦合系数，Q表示空载品质因数)，并提高无线功率传输(WPT)系统的功率传输效率(PTE)。该结构由四个小谐振器组成，它们级联在一起，用单一激励馈电，每个谐振器由两个同心矩形环组成。在传输距离为20 mm时，这种级联结构能够达到最大PTE的89.5%。随后，使用堆叠的超材料透镜组成的无源继电器系统来延长功率传输距离和解决不对准问题。利用所提出的WPT系统，传输距离增加到80 mm，PTE为50%。与级联结构相比，这种与超材料的集成在合理的PTE的情况下实现了300%的传输距离改进。然后利用两个堆叠的超材料组件来进一步延长传输距离，在不影响PTE的情况下提供额外的200%的提高。对错位进行了深入的研究，证明了所提出的系统能够在合理的PTE的情况下独立于接收器的位置来传输功率。据我们所知，该结构是第一个将多个级联谐振器与堆叠的超材料集成在一起用于WPT应用的结构。

In FY2022, a new cascaded structure was proposed to improve the coupled KQ product (where K represents the coupling coefficient and Q represents the unloaded quality factor) and boost the power transfer efficiency (PTE) of the wireless power transfer (WPT) system. The structure consists of four small resonators that are cascaded together and fed with a single excitation, with each resonator consisting of two concentric rectangular rings. This cascaded structure is capable of achieving a maximum PTE of 89.5% at a transfer distance of 20 mm.Subsequently, a passive relay system made of stacked metamaterial lenses is used to extend the power transfer distance and address misalignment issues. With the proposed WPT system, the transfer distance is increased to 80 mm with a PTE of 50%. This integration with metamaterials achieves a 300% improvement in the transfer distance with a reasonable PTE compared to the cascaded structure alone. An assembly of two stacked metamaterials is then utilized to further extend the transfer distance, providing an additional 200% enhancement without affecting PTE.A thorough study of misalignment was conducted, demonstrating that the proposed system is capable of transferring power independently of the position of the receiver with a reasonable PTE. To the best of our knowledge, the proposed structure is the first to employ multiple cascaded resonators integrated with stacked metamaterials for WPT applications.