新型智能金属手表NFC天线设计

Design of a novel NFC antenna for smart watch with metal frame

针对现有近场通讯(Near Field Communication,NFC)天线不能良好工作于金属外框智能手表的问题,提出了新型天线设计方案,使该设计结构的NFC天线可良好工作于金属外框的智能手表当中。NFC天线通常为以中心环绕的螺旋线圈构成的金属结构,配合磁性基板材料,工作于电子设备内部。而金属外壳智能手表使NFC螺旋线圈包围在金属外壳之中,金属外框产生涡流,将很大程度抵消NFC天线所产生的信号,导致通讯效果降低。将两个NFC天线结构组成新的NFC天线,该天线在两个NFC天线公共边的一侧电流相同,在非公共边的部分电流相反,采用公共边的部分进行通讯,非公共边部分抵消金属外框的涡流效应,从而达到提升通讯效果的目的。

In this paper, considering the normal near field communication （NFC） antenna can not work well in the metal frame smart watch, so a new design is proposed, so that the new design of the structure of the NFC antenna can work well in the metal frame smart watch. The NFC antenna is generally surrounded by the center of the metal spiral coil, with the magnetic substrate working inside the smart watch. The metal shell smart watch makes NFC spiral coil surrounded by metal shell, and the metal frame produces eddy current, will greatly offset the NFC antenna generated by the signal, resulting in lower communication effects. In this paper, a novel NFC antenna composed of two NFC antennas is proposed. The antenna has the same current on one side of the common side of the two NFC antennas. In the non-common side, the current is opposite to that of the common side, and the non-common side is canceled metal frame of the eddy current effect, so as to achieve the purpose of enhancing the communication effect.