基于超材料的宽频带微带折射率传感器的研究

发布时间：2018-03-10 02:14

本文选题：超材料　切入点：微带传感器　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：超材料是一种亚波长结构单元组成的周期性人工电磁材料,其在特定的频段内表现为负的介电常数和磁导率,并且具有某些奇异的电磁特性,如慢波特性、负多普勒效应等。基于超材料的传感器正引发越来越多的关注,这类传感器不存在分离元件,具有小型化、高灵敏度的特点,可以很方便地与其他微波器件进行集成。首先本文对国内外的超材料传感器进行了总结分析,并且在此基础上,对传感器的工作原理和分析方法进行了阐述及总结。本文的主要内容如下:(1)概括性地介绍了传输线理论、开口谐振SRR(Split Ring Resonator)和开口互补谐振环CSRR(Complementary Split Ring Resonator)的相关工作机理。同时,着重研究了从S参数中提取媒质等效的电磁参数的方法,并且对其进行了详细验证。另外,重点介绍了超材料传感器等效电路模型,这将有助对超材料传感器进行分析及进一步的改进。(2)设计了两种不同的谐振环:齿轮型CSRR和双互补螺旋DCSR(Double Complementary Split Resonator),并将两种尺寸相同的谐振环分别加载改进后的微带线进行了仿真模拟,对影响传感器的性能的相关主要参数进行了分析讨论;另外对两种谐振环进行了比较分析。(3)最后,设计了一种差分型超材料传感器。首先介绍了分频器的原理,然后在分频器的基础上加载一对齿轮型CSRR作为差分型折射率传感器。通过优化参数使得传感器一个谐振频率固定,通过两谐振频率的差值来消除外界因素的干扰得出更加精确的待测物体的折射率。通过仿真实验证明该传感器具有更高的灵敏度,误差也处于可控范围之内。
[Abstract]:Metamaterials are periodic artificial electromagnetic materials composed of subwavelength structure units, which exhibit negative permittivity and permeability in specific frequency bands, and have some strange electromagnetic properties, such as slow wave properties. Negative Doppler effect and so on. The sensor based on supermaterial is attracting more and more attention. This kind of sensor has the characteristics of miniaturization and high sensitivity. It can be easily integrated with other microwave devices. Firstly, this paper summarizes and analyzes the supermaterial sensors at home and abroad, and on this basis, The working principle and analytical method of the sensor are described and summarized. The main contents of this paper are as follows: 1) the transmission line theory, the open resonance SRR(Split Ring Resonator and the open complementary resonant ring CSRR(Complementary Split Ring Resonator) are introduced. The method of extracting the equivalent electromagnetic parameters from the S parameters is studied and verified in detail. In addition, the equivalent circuit model of the supermaterial sensor is introduced emphatically. This will help to analyze and further improve the metamaterial sensors. We have designed two different resonant rings: the gear CSRR and the double complementary helical DCSR(Double Complementary Split Resonator. The strip line is simulated by simulation. The main parameters affecting the performance of the sensor are analyzed and discussed. In addition, two resonant rings are compared and analyzed. Finally, a differential hypermaterial sensor is designed. Firstly, the principle of the frequency divider is introduced. Then a pair of gear type CSRR is loaded on the basis of the frequency divider as the differential refractive index sensor, and the resonant frequency of the sensor is fixed by optimizing the parameters. The refractive index of the object to be measured is obtained by eliminating the interference of external factors by the difference of the two resonant frequencies. The simulation results show that the sensor has higher sensitivity and the error is within the controllable range.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP212;TB34

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