In this article, a planar inverted‐F antenna (PIFA) pair with reflectors for near‐field power transfer at a frequency of 2.45 GHz is proposed. In order to enhance efficiency of power transmission and reduce electromagnetic wave leaked to free space due to the power transmission, the reflectors are installed around the transmitting and receiving antenna pair except on the open side. The transmitting antenna is designed with high impedance characteristics to prevent the radiated electromagnetic wave to free space when the antenna is waiting for the power transmission. The receiving antenna is designed for Wi‐Fi and also functions as an antenna for energy harvesting at a frequency of 2.4 GHz when the antenna operates solely. Furthermore, the L‐shaped slot is added on the FR‐4 substrate of the receiving antenna as a harmonic rejection filter (HRF) used to suppress reradiation of the higher order harmonics and improve the conversion efficiency. The conversion efficiency of the proposed transmitting and receiving antenna pair is 79.4% when the input RF power is 23 dBm.

中文翻译：

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带有反射器的平面倒F天线对的设计，用于近场功率传输

在本文中，提出了带有反射器的平面倒F型天线（PIFA）对，用于在2.45 GHz频率下进行近场功率传输。为了提高电力传输的效率并减少由于电力传输而泄漏到自由空间的电磁波，反射器被安装在发射和接收天线对的周围，除了开放侧。发射天线被设计为具有高阻抗特性，以防止在天线等待电力传输时电磁波辐射到自由空间。接收天线专为Wi-Fi设计，当该天线单独运行时，它还可以用作以2.4 GHz频率收集能量的天线。此外，在接收天线的FR-4基板上添加了一个L形槽，作为谐波抑制滤波器（HRF），用于抑制高次谐波的辐射并提高转换效率。当输入RF功率为23 dBm时，建议的发射和接收天线对的转换效率为79.4％。