可拉伸液态金属天线与RFID标签设计

发布时间：2018-02-01 01:12

本文关键词： 可拉伸电子 RFID 偶极子天线液态金属天线设计　出处：《华中科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：将柔性可拉伸电子技术用于天线和RFID标签设计,可以得到具有拉伸性能的RFID标签,在生物医疗检测、汽车胎压传感等领域具有广泛应用前景。液态金属是制备可拉伸天线的常用材料,液态金属天线在拉伸过程中,通过电学性能变化来实现对应变的传感。但是,如何使拉伸后的天线依然能够保持稳定的谐振频率,依然是当前的研究难点之一。本文对超高频RFID标签展开研究,设计并制备了具有稳定谐振频率的可拉伸超高频RFID标签,同时通过有限元仿真和实验分析验证了天线结构设计的合理性,主要工作包括:1)针对RFID标签中的偶极子天线,提出了基于蜿蜒结构的液态金属天线设计方法,研究了蜿蜒结构高宽比对拉伸过程中天线频率的影响规律,实现了偶极子天线拉伸50%后仍能保持谐振频率稳定,通过有限元仿真验证设计合理性,解决了可拉伸天线变形过程中频率波动的难题。2)通过液态金属注入工艺制备了多组不同高宽比的蜿蜒结构偶极子天线,测试了液态金属天线在不同变形作用下谐振频率的稳定性,以及高宽比对天线在拉伸过程中电学性能的影响。3)提出了可拉伸RFID标签天线的设计方法,研究了蜿蜒结构周期数对天线性能的影响,理论计算得到RFID标签天线结构高宽比的取值区间,通过有限元仿真分析不同高宽比的标签天线在拉伸应力作用下谐振频率和读写距离的影响规律,设计并制备出具有良好拉伸性能的RFID标签,在最大50%拉伸应变条件下仍然具有相对稳定的谐振频率,并且工作性能不受到拉伸应力的影响。综上所述,本文提出了一种可拉伸液态金属偶极子天线结构的改进设计,研究了不同参数对偶极子天线受到拉伸后谐振频率变化的影响,运用所提出的偶极子天线结构于RFID标签天线设计中,制备出了谐振频率稳定的可拉伸RFID标签。
[Abstract]:The flexible extensible electronic technology is used in antenna and RFID tag design, and the RFID tag with tensile property can be obtained in biomedical detection. Liquid metal is a common material for the preparation of extensible antenna. In the process of drawing the liquid metal antenna can realize the strain sensing through the change of electrical properties. However liquid metal antenna is widely used in the field of automotive tire pressure sensing. How to make the stretched antenna can still maintain a stable resonant frequency is still one of the difficulties in the current research. UHF RFID tags are studied in this paper. A extensible UHF RFID tag with stable resonant frequency is designed and fabricated. The rationality of antenna structure design is verified by finite element simulation and experimental analysis. The main work includes: 1) A design method of liquid metal antenna based on meandering structure is proposed for the dipole antenna in RFID tag. The influence of aspect ratio of winding structure on antenna frequency is studied. The resonant frequency of dipole antenna 50% can be kept stable after stretching. The rationality of the design is verified by finite element simulation. The problem of frequency fluctuation in the deformation of extensible antenna is solved. 2) A number of winding dipole antennas with different aspect ratios are fabricated by liquid metal injection. The resonant frequency stability of liquid metal antenna under different deformation and the effect of aspect ratio on electrical properties during stretching are tested. 3) the design method of extensible RFID tag antenna is proposed. The effect of winding structure period number on antenna performance is studied, and the range of aspect ratio of RFID tag antenna structure is obtained by theoretical calculation. The influence of resonance frequency and read / write distance of tag antenna with different aspect ratio under tensile stress is analyzed by finite element simulation. The RFID tag with good tensile performance is designed and fabricated. Under the maximum tensile strain of 50%, the resonance frequency is relatively stable, and the working performance is not affected by the tensile stress. In this paper, an improved structure of extensible liquid metal dipole antenna is proposed, and the influence of different parameters on the resonant frequency of the dipole antenna is studied. Using the proposed dipole antenna structure in the design of RFID tag antenna, the extensible RFID tag with stable resonant frequency is fabricated.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN820;TP391.44

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