基于数字化微喷射技术搭建了射频识别(RFID)标签天线的按需微喷射制备系统。首先, 将纳米银导电墨水按需微喷射到镀有疏水化薄膜的聚对苯二甲酸乙二醇脂(PET)基底表面形成天线图形; 然后在恒温干燥箱内烧结, 形成RFID标签天线。实验研究了微喷射系统参量对液滴产生的影响以及制备参数对纳米银导线成线的影响, 制得了最小线宽为100 μm、厚度为2.8 μm、电阻率为5.2 μΩ·cm且阻值具有较好线性度的导线。设计、仿真和制备了弯折偶极子天线, 并对其性能参数进行了测试, 结果显示其天线谐振频率、带宽和谐振点S11参数等与仿真结果具有较好的一致性。实验结果表明, 按需微喷射导电银墨水制备RFID标签天线的方法具有系统结构简单、成本较低、液滴微喷射精确、便于制备任意天线图形等特点; 制备的弯折偶极子天线尺寸可控、导电性高、阻值均一性好, 并具有较好的天线性能。

A system for the fabrication of RFID(Radio Frequency Identification) tag antenna was setup based on a digital drop-on-demand technology. Firstly, the conductive ink was jetted on the polyethylene terephthalate (PET) substrate with a hydrophobic thin film to form the designed antenna pattern. Then the conductive pattern was sintered to form the RFID tag antenna in an oven. The influences of the system parameters on the generation of droplets and the fabrication parameters on the formation of the conductive line were researched. The conductive line with a width of 100 μm,a thickness of 2.8 μm and the resistivity of 5.2 μΩ·cm was obtained, and its resistance was almost proportional to the length. Furthermore, a folded dipole antenna was designed, simulated and fabricated, and the performance of the antenna was measured. The results show that the resonant frequency, bandwidth and the S11 parameters of the antenna fabricated are in agreement with the simulation results. The experimental results indicate that the fabrication of the RFID tag antenna based on the drop-on-demand technology has advantages in simple system construction, low cost, accurate droplet ejection and a flexible antenna pattern. Moreover, the folded dipole antenna is characterized by size controllability, high conductivity, good resistance uniformity and good antenna performance.