This paper proposes and verifies a complete design flow of miniaturizing a coil antenna and widening its impedance bandwidth for near-field application, such as NFC, RFID and WPT. The proposed scheme based on mature electronic element matching technology is interpreted in detail by two equivalent circuit models in theory. For convenience, only the series equivalent circuit and its matching circuit are respectively established in the circuit simulator ADS and ANSYS HFSS to assess the scheme proposed from two aspects. The parallel equivalent circuit can be optimized by a similar approach. Then, a WPT system is established in HFSS to further verify the feasibility of miniaturization. Finally, the dimension of the coil antenna can be reduced by about 70%, and its impedance bandwidth can be increased by approximately 40% after two electronic modules are integrated.

中文翻译：

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基于匹配电路的线圈天线小型化全流程

本文提出并验证了用于近场应用（例如NFC，RFID和WPT）的线圈天线小型化和加宽其阻抗带宽的完整设计流程。理论上通过两个等效电路模型对基于成熟电子元件匹配技术的方案进行了详细解释。为方便起见，仅在电路仿真器ADS和ANSYS HFSS中分别建立了串联等效电路及其匹配电路，以从两个方面评估所提出的方案。可以通过类似的方法来优化并联等效电路。然后，在HFSS中建立WPT系统，以进一步验证小型化的可行性。最后，线圈天线的尺寸可以减少约70％，