面向干式水表产品追溯的RFID标签天线设计

Design of RFID tag antenna for quality traceability of dry-type water meter

为了实现干式水表制造过程产品追溯,以便对干式水表的质量和数量进行有效监测,根据干式水表的内部结构,设计了一款性能满足干式水表产品追溯的小型化抗金属超高频PCB RFID标签。该标签天线采用弯折偶极子结构,可嵌入到水表中。为改善金属环境中RFID标签天线的性能,基于干式水表的内部结构和尺寸的约束,通过对天线电小环进行内凹弯折结构设计、调试与仿真,发现对天线中心频点和回波损耗的影响程度,实现对标签天线的小型化设计。对标签天线样品实物进行实际距离测试和天线最低激活功率测试,验证了所设计的标签天线嵌入水表后的最大识读距离为3.2 m,实际中心频点为900 MHz,满足产品追溯的识读要求。

In order to achieve the quality traceability of the dry-type water meter manufacturing process,so as to effectively monitor the quality and quantity of the dry-type water meter,according to the internal structure of the dry-type water meter,a miniaturized metal-resistant ultra-high frequency(UHF)printed circuit board(PCB)radio frequency identification(RFID)tags with performance to meet the quality traceability of the dry-type water meter is designed.The tag antenna adopts a bent dipole structure and can be embedded in a water meter.To improve the performance of RFID tag antennas in metal environments,based on the internal structure and size constraints of dry water meters,through the design,debugging and simulation of the concave bending structure of the antenna electric small loop,it discovers the degree of influence on the antenna center frequency and return loss,and realizes the miniaturization design of the tag antenna.The actual distance test and the minimum activation power test of the tag antenna sample verify that the maximum reading distance of the designed tag antenna after being embedded in the water meter is 3.2 m,and the actual center frequency is 900 MHz,which meets the reading requirements for quality traceability.