新型13.56 MHz NFC天线的研究与设计

Research and Design of Novel Type 13.56 MHz NFC Antenna

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 d B),其回波损耗降低至-28.8 d B,-10 d B以下的带宽为0.8 MHz。

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 ram, S = 1 ram, 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.