本文關(guān)鍵詞： 可拉伸電子 RFID 偶極子天線 液態(tài)金屬 天線設(shè)計(jì)　出處：《華中科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：將柔性可拉伸電子技術(shù)用于天線和RFID標(biāo)簽設(shè)計(jì),可以得到具有拉伸性能的RFID標(biāo)簽,在生物醫(yī)療檢測(cè)、汽車胎壓傳感等領(lǐng)域具有廣泛應(yīng)用前景。液態(tài)金屬是制備可拉伸天線的常用材料,液態(tài)金屬天線在拉伸過(guò)程中,通過(guò)電學(xué)性能變化來(lái)實(shí)現(xiàn)對(duì)應(yīng)變的傳感。但是,如何使拉伸后的天線依然能夠保持穩(wěn)定的諧振頻率,依然是當(dāng)前的研究難點(diǎn)之一。本文對(duì)超高頻RFID標(biāo)簽展開(kāi)研究,設(shè)計(jì)并制備了具有穩(wěn)定諧振頻率的可拉伸超高頻RFID標(biāo)簽,同時(shí)通過(guò)有限元仿真和實(shí)驗(yàn)分析驗(yàn)證了天線結(jié)構(gòu)設(shè)計(jì)的合理性,主要工作包括:1)針對(duì)RFID標(biāo)簽中的偶極子天線,提出了基于蜿蜒結(jié)構(gòu)的液態(tài)金屬天線設(shè)計(jì)方法,研究了蜿蜒結(jié)構(gòu)高寬比對(duì)拉伸過(guò)程中天線頻率的影響規(guī)律,實(shí)現(xiàn)了偶極子天線拉伸50%后仍能保持諧振頻率穩(wěn)定,通過(guò)有限元仿真驗(yàn)證設(shè)計(jì)合理性,解決了可拉伸天線變形過(guò)程中頻率波動(dòng)的難題。2)通過(guò)液態(tài)金屬注入工藝制備了多組不同高寬比的蜿蜒結(jié)構(gòu)偶極子天線,測(cè)試了液態(tài)金屬天線在不同變形作用下諧振頻率的穩(wěn)定性,以及高寬比對(duì)天線在拉伸過(guò)程中電學(xué)性能的影響。3)提出了可拉伸RFID標(biāo)簽天線的設(shè)計(jì)方法,研究了蜿蜒結(jié)構(gòu)周期數(shù)對(duì)天線性能的影響,理論計(jì)算得到RFID標(biāo)簽天線結(jié)構(gòu)高寬比的取值區(qū)間,通過(guò)有限元仿真分析不同高寬比的標(biāo)簽天線在拉伸應(yīng)力作用下諧振頻率和讀寫距離的影響規(guī)律,設(shè)計(jì)并制備出具有良好拉伸性能的RFID標(biāo)簽,在最大50%拉伸應(yīng)變條件下仍然具有相對(duì)穩(wěn)定的諧振頻率,并且工作性能不受到拉伸應(yīng)力的影響。綜上所述,本文提出了一種可拉伸液態(tài)金屬偶極子天線結(jié)構(gòu)的改進(jìn)設(shè)計(jì),研究了不同參數(shù)對(duì)偶極子天線受到拉伸后諧振頻率變化的影響,運(yùn)用所提出的偶極子天線結(jié)構(gòu)于RFID標(biāo)簽天線設(shè)計(jì)中,制備出了諧振頻率穩(wěn)定的可拉伸RFID標(biāo)簽。
[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.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN820;TP391.44

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本文編號(hào)：1480505