新型 13. 56 MHz NFC 天线的研究与设计

针对现有的 13. 56 MHz NFC(Near Field Communication)天线因结构而引起回波损耗偏高的问题, 设计 了一种工作在 13. 56 MHz 的近场通信天线, 通过优化天线结构, 有效降低了天线的回波损耗。 使用 Ansoft HFSS(High Frequency Structure Simulator)进行天线模型的设计以及仿真分析, 对 NFC 天线的 3 大结构参数 (天线边长 L x 、 线间距 S 和线径 W)进行了仿真分析探究, 最后得到以 13. 56 MHz 为中心频率的最优天线结 构参数, 即 L x =40 mm, S=1 mm 和 W= 0. 5 mm。 在上述天线结构参数下, 优于已有的 NFC 天线(回波损耗 为-22. 2 dB), 其回波损耗降低至-28. 8 dB, -10 dB 以下的带宽为0. 8 MHz。

Research and Design of Novel Type 13.56 MHz NFC Antenna

There is a problem of high return loss for the existing 13.56 MHz NFC (Near Field Communication) antennas due to the antenna structure,so a kind of NFC antenna applied in the 13.56 MHz near field communication was designed by the innovation of the antenna structure,which reduces the return loss of the antenna.We use Ansoft HFSS (High Frequency Structure Simulator) to establish antenna and simulation analysis,and the simulation on three structure parameters of NFC antenna (antenna length Lx,track interval S and line width W) is carried out.The optional antenna structure parameters are derived taking 13.56 MHz as the center frequency,namely Lx =40 mm,S =1 mm,W =0.5 mm.Under the above structural parameters,antenna exhibits better performance compared to the former NFC antenna(return loss is-22.2 dB),whose return loss is as low as-28.8 dB and the effective bandwidth of the-10 dB is 0.8 MHz.