This study reports, for the first time, the use of coupled-line-based impedance matching in wireless power transfer (WPT) system. The transmitter and receiver of the WPT system are realised by microstrip feed line and symmetric coupled line at the top plane. The ground plane is realised with triangular-shaped defect along with the excitation slot mounted by an external capacitor. The defect in the ground plane and the external capacitor regulate the resonant frequency and also enable miniaturisation of the WPT system. The design is augmented with a systematic analytical approach for impedance matching and a simplified design procedure for the WPT system. A novel equivalent circuit model consisting of parallel LC network and coupled lines is also developed for the evaluation of the proposed WPT system design technique. A prototype of the system operating at 300 MHz developed on Rogers RO4350B substrate achieves a peak efficiency of 80% at a transmission distance of 17 mm. An excellent agreement between the measured and the electromagnetic simulated results is a testament of the robustness of the proposed design technique. Furthermore, evaluation of the commonly used WPT-related figure of merit shows significant enhancement when compared to the existing state of the art.

中文翻译：

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通过耦合线阻抗匹配提高有缺陷的地面结构型近场射频WPT系统的性能

这项研究首次报告了基于耦合线的阻抗匹配在无线电力传输（WPT）系统中的使用。WPT系统的发送器和接收器是通过微带馈线和对称耦合线在顶部平面实现的。接地平面具有三角形缺陷，并且励磁槽由外部电容器安装。接地层和外部电容器中的缺陷调节了谐振频率，还使WPT系统小型化。通过用于阻抗匹配的系统分析方法和用于WPT系统的简化设计程序来增强设计。还开发了一种由并联LC网络和耦合线路组成的新型等效电路模型，用于评估所提出的WPT系统设计技术。在Rogers RO4350B基板上开发的以300 MHz运行的系统原型在17 mm的传输距离上实现了80％的峰值效率。测量结果与电磁仿真结果之间的极佳一致性证明了所提出设计技术的坚固性。此外，与现有技术水平相比，对常用的WPT相关性能指标的评估显示出显着增强。