超高频RFID小型化读写器天线设计

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 dB 的阻抗带宽为25 Hz(910 ~ 935 MHz),轴比(AR)小于3 dB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 dB,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。

Design of an Ultra High Frequency RFID Mini Reader Antenna

Put forward a reader circularly polarized microstrip antenna what is used in UHF band (Ultra High Frequency, UHF) (912 ~ 935 MHz), which is suitable for radio frequency identification (Radio Frequency, Identification, RFID) application. The antenna is with single layer structure, the substrate is FR4 plate to achieve low price, the structure of the radiation patch is with slots to achieve miniaturization, then the floor using slotted structure improves the gain of the antenna, the antenna miniaturization design meets the requirements of the antenna design. Using the electromagnetic simulation software analyzes the erformance,simulation results are compared with the measurements,and a good agreement is obtained. The measurements show that the antenna''s return loss is less than -10 dB for the 25 MHz (910 ~935 MHz),axial ration with bandwidth of 21 MHz(914 ~935 MHz) is under 3 dB,and a gain level of about -1.2 dB respectively. Therefore, the proposed antenna can be a good candidate for China RFID readers/ writers operating at 920MHz.