针对NFC(near field communication)天线的交互效率不高,导致传输信号不稳定的问题,可以分析天线的参数与电路的结构,使天线性能达到最优.利用Ansoft HFSS(high fre-quency structure simulator)进行环形天线的建模与分析,讨论了天线的结构参数对天线性能的影响,分析了RLC电路对天线电感的影响,设计了串联匹配电路.对天线的带宽进行了优化,并对设计的耦合天线传输距离进行仿真,确定最佳耦合距离,提高天线的品质因数.结果表明:天线的回波损耗降低至-27.25 dB,最佳耦合距离为20 mm.
Research and design of NFC antennas based on HFSS
The interaction efficiency of NFC ( near field communication ) antenna is not high,resulting in unstable transmission signal. The parameters of the antenna and the structure of the circuit are analyzed to make the antenna performance optimal. In this design, Ansoft HFSS ( high frequency structure simulator ) is employed to model and analyze the loop antenna and the influence of the structural parameters of the antenna on the antenna performance is discussed. The influence of the RLC circuit on the antenna inductance is proposed, and the series matching circuit is designed. Meanwhile, the bandwidth of the antenna is optimized, and the transmission distance of the designed coupled antenna is simulated to determine the optimal coupling distance to improve the quality factor of the antenna. Our results show with the newly designed structure, the return loss of the antenna is cut to -27.25 dB, and the optimal coupling distance reaches 20 mm.
communication technologyNFC antennasHFSS simulationmatching circuit
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