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提出了一款应用于超高频段(Ultra High Frequency,UHF)(912~935 MHz)的射频识别(RFID)读写器圆极化单层结构微带天线,基板采用FR4板材达到价格低廉、辐射贴片采用开槽的结构实现小型化、接地板采用开槽结构提高天线的增益,该天线实现了小型化设计,满足了天线的设计要求。利用三维电磁仿真软件对天线模型进行了分析,仿真与测试结果吻合良好。天线测试结果表明:回波损耗小于-10 d B的阻抗带宽为25 MHz(910~935MHz),轴比(AR)小于3 d B的带宽为21 MHz(914~935 MHz);在UHF频段内,读写器天线的最大增益为-1.2 d B,所以本天线能满足我国射频识别读写器的应用要求,具有良好的应用前景。
A circularly polarized single-layer microstrip antenna with RFID reader for UHF (912 ~ 935 MHz) is proposed. The substrate is FR4 with low cost and radiation The chip adopts a slotted structure to achieve miniaturization, and the ground plate adopts a slotted structure to improve the gain of the antenna. The antenna is miniaturized and meets the design requirements of the antenna. The antenna model was analyzed by 3D electromagnetic simulation software. The simulation and test results are in good agreement. The antenna test results show that the impedance bandwidth of less than -10 d B is 25 MHz (910 ~ 935 MHz) and the bandwidth of AR is less than 3 d B is 21 MHz (914 ~ 935 MHz). In the UHF band , The maximum gain of the reader antenna is -1.2 d B, so the antenna can meet the application requirements of our country’s RFID reader and has a good application prospect.