基于贴片型结构的超材料的特性研究与设计
发布时间：2019-01-10 07:20
【摘要】：“Metamaterial”是21世纪物理学领域出现的一个新的学术词汇,近年来经常出现在各类科学文献。一般文献中都认为metamaterial是“具有天然材料所不具备的超常物理性质的人工复合结构或复合材料”。因为其具有很多新奇的电磁特性,超材料就可以广泛应用在微波以及光学领域。本文通过电磁仿真软件HFSS的仿真对超材料进行了特性研究与设计。主要工作包括:首先,针对传统S参数提取法的多值性和厚度谐振问题,改进了S参数提取方法,并通过预设模型证明此方法具有普适性和精确性。其次,设计了新型共面双L型结构的超材料,分别构建了这种结构单元的等效介电常数和磁导率的等效电路模型,并且根据两个电路模型推导出相应的等效介电常数和等效磁导率的公式,并且从推导的公式中分析磁谐振频率与结构单元的各个尺寸之间的关系。再次,引入了一种S型结构的超材料,分别构建了这种结构单元的磁导率的等效电路模型和介电常数的等效电路模型,并且从推导的公式中分析了磁谐振频率与结构单元的各个尺寸之间的关系。通过合理的调整尺寸,最终得到了负通带宽度为6.8GHz的改进型超材料结构,是最初S型结构负通带带宽的9.7倍,有效地拓宽了这种超材料的带宽。最后,提出基于改进S型超材料结构的同轴滤波器,将超材料结构添加到同轴滤波器的介质层内,利用其在频段内的阻带效应,实现滤波器的功能。本文利用HFSS软件对这种同轴滤波器的滤波特性进行仿真,并应用相关理论对其原理进行深入的分析。该滤波器或可在微波工程中有广泛的应用前景。
[Abstract]:"Metamaterial" is a new academic term in the field of physics in the 21st century. In general literature, metamaterial is considered as "artificial composite structure or composite material with supernormal physical properties which are not possessed by natural materials". Because of its many novel electromagnetic properties, metamaterials can be widely used in microwave and optical fields. In this paper, the characteristics of metamaterials are studied and designed by the simulation of electromagnetic simulation software HFSS. The main works are as follows: firstly, the S-parameter extraction method is improved to solve the multi-value and thickness resonance problems of the traditional S-parameter extraction method, and the presupposition model is used to prove that the method is universal and accurate. Secondly, a new type of coplanar double L-type supermaterial is designed, and the equivalent circuit models of the equivalent permittivity and permeability of the structure element are constructed, respectively. According to the two circuit models, the corresponding formulas of equivalent dielectric constant and equivalent permeability are derived, and the relationship between the magnetic resonance frequency and the various dimensions of the structure unit is analyzed from the derived formulas. Thirdly, an S-type supermaterial is introduced, and the equivalent circuit model of permeability and the equivalent circuit model of permittivity are constructed, respectively. The relationship between the magnetic resonance frequency and the size of the structure element is analyzed from the derived formula. By adjusting the size reasonably, the modified supermaterial structure with the negative passband width of 6.8GHz is obtained, which is 9.7 times of the initial S-type structure's negative passband bandwidth, which effectively broadens the bandwidth of the supermaterial. Finally, a coaxial filter based on the improved S-type supermaterial structure is proposed. The supermaterial structure is added to the dielectric layer of the coaxial filter, and the function of the filter is realized by using its stopband effect in the frequency band. In this paper, the filtering characteristics of the coaxial filter are simulated by using HFSS software, and the principle of the filter is analyzed by using the relevant theory. The filter may be widely used in microwave engineering.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O441.6;TB39
本文编号：2406046
[Abstract]:"Metamaterial" is a new academic term in the field of physics in the 21st century. In general literature, metamaterial is considered as "artificial composite structure or composite material with supernormal physical properties which are not possessed by natural materials". Because of its many novel electromagnetic properties, metamaterials can be widely used in microwave and optical fields. In this paper, the characteristics of metamaterials are studied and designed by the simulation of electromagnetic simulation software HFSS. The main works are as follows: firstly, the S-parameter extraction method is improved to solve the multi-value and thickness resonance problems of the traditional S-parameter extraction method, and the presupposition model is used to prove that the method is universal and accurate. Secondly, a new type of coplanar double L-type supermaterial is designed, and the equivalent circuit models of the equivalent permittivity and permeability of the structure element are constructed, respectively. According to the two circuit models, the corresponding formulas of equivalent dielectric constant and equivalent permeability are derived, and the relationship between the magnetic resonance frequency and the various dimensions of the structure unit is analyzed from the derived formulas. Thirdly, an S-type supermaterial is introduced, and the equivalent circuit model of permeability and the equivalent circuit model of permittivity are constructed, respectively. The relationship between the magnetic resonance frequency and the size of the structure element is analyzed from the derived formula. By adjusting the size reasonably, the modified supermaterial structure with the negative passband width of 6.8GHz is obtained, which is 9.7 times of the initial S-type structure's negative passband bandwidth, which effectively broadens the bandwidth of the supermaterial. Finally, a coaxial filter based on the improved S-type supermaterial structure is proposed. The supermaterial structure is added to the dielectric layer of the coaxial filter, and the function of the filter is realized by using its stopband effect in the frequency band. In this paper, the filtering characteristics of the coaxial filter are simulated by using HFSS software, and the principle of the filter is analyzed by using the relevant theory. The filter may be widely used in microwave engineering.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O441.6;TB39
【参考文献】
相关期刊论文 前1条
1 皇甫江涛,冉立新,陈抗生;一种新型人工异向介质结构的设计和仿真[J];浙江大学学报(工学版);2005年04期
，本文编号：2406046
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