An electrically small Huygens circularly polarized (HCP) rectenna whose antenna is directly matched to its rectifying circuit is developed and experimentally validated in the ISM band at 915 MHz. The HCP antenna is a near-field resonant parasitic (NFRP) design consisting of a driven element and a crossed pair of balanced electric and magnetic NFRP dipole elements. The rectifier circuit is highly capacitive. It is a full-wave design based on two HSMS286C Schottky diodes. Two innovative driven element designs are explored that facilitate the effective conjoin of the antenna to different classes of external circuits. An HCP antenna with a driven spiral line element is demonstrated. Its input impedance is capacitive and, hence, the system is ideal for matching directly to an inductive external circuit. An HCP antenna with a driven loop element is investigated in a similar manner. The system has an inductive input impedance that is subsequently optimized to be conjugately match to the capacitive rectifier directly. The measured HCP rectenna prototype has broad-angle capture capacity, avoids any polarization mismatch issues, and has exceptional ac to dc conversion efficiency, the maximum reaching 90.6%. It is an ideal candidate for wireless power transfer (WPT)-enabled Internet-of-Things (IoT) applications.

中文翻译：

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带有驱动环路元件的小型惠更斯 CP 整流天线可最大限度地提高其无线电力传输效率

开发了一种电子小型惠更斯圆极化 (HCP) 整流天线，其天线直接与其整流电路匹配，并在 915 MHz 的 ISM 频段中进行了实验验证。HCP 天线是一种近场谐振寄生 (NFRP) 设计，由一个驱动元件和一对交叉的平衡电和磁 NFRP 偶极元件组成。整流电路是高容性的。它是基于两个 HSMS286C 肖特基二极管的全波设计。探索了两种创新的驱动元件设计，以促进天线与不同类别的外部电路的有效连接。演示了带有驱动螺旋线元件的 HCP 天线。它的输入阻抗是电容性的，因此，该系统非常适合直接与电感性外部电路匹配。以类似的方式研究了带有驱动环元件的 HCP 天线。该系统具有电感输入阻抗，随后对其进行优化以直接与电容整流器共轭匹配。测得的 HCP 整流天线原型具有广角捕获能力，避免了任何极化失配问题，并具有出色的交流到直流转换效率，最高可达 90.6%。它是支持无线电源传输 (WPT) 的物联网 (IoT) 应用的理想选择。最高可达 90.6%。它是支持无线电源传输 (WPT) 的物联网 (IoT) 应用的理想选择。最高可达 90.6%。它是支持无线电源传输 (WPT) 的物联网 (IoT) 应用的理想选择。