Abstract: 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 L x , 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 L x = 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.

Key words: return loss, high frequency structure simulator (HFSS) simulation, communication technology, near field communication(NFC) antenna