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该论文提出了一种毫米级植入式电源接收器，通过自适应链路补偿技术实现了无线能量传输。与传统需要厘米级天线的设计相比，该接收器天线面积缩小了100倍，扩展了生物医学植入设备的应用范围。
Wireless powering of implanted devices obviates the need for batteries, which must be periodically replaced and constitute a health risk. There has long been an assumption that efficient wireless transfer of power to biomedical implants requires fields operating in the low MHz in order to avoid excess losses in tissue, thus requiring antenna diameters of a few cm [1]. Such antennae increase device size and thereby restrict the range of viable applications. This work presents a wireless power transfer system that uses an antenna area 100× smaller than previous designs [2] while maintaining the same power transfer efficiency over the same range. Our theoretical investigation [3] has shown that the optimal transmission frequency is in the GHz range for infinitesimally small antennae: ωRSW ≈ F ε U Gτ (ε U − ε ∞ ) (1) provided Gε U >> Fτ (ε U − ε ∞ ) , where d is the transmit-receive antenna separation, εr0 and ε∞ are the relative permittivities of the tissue at dc and infinite
Stephen O’Driscoll, Ada S. Y. Poon, Teresa H. Meng
Stanford University, Stanford, CA