电磁异向介质设计及在生物医学中的应用
发布时间：2019-02-19 12:18
【摘要】：电磁异向介质已经成为当前电磁工程的研究热点之一,凭借其独特的“负折射特性”、“后向波特性”等性质在固体物理学、材料科学、光学、应用电磁学、生物医学工程等领域受到广泛青睐。目前电磁异向介质方面的研究主要集中于异向特性研究,介质单元结构设计,双负特性验证以及异向介质应用等几个方面。本文在前人经验基础上进一步研究,设计出两种性能优良的电磁异向介质并将之应用于生物医学工程领域。 本文主要工作有： 1)详细阐述了经典电磁异向介质的构造原理,介绍了Rod阵列负介电常数成因和SRR结构、对口环谐振器负磁导率的成因。 2)提出了一种工作于S频段的电磁异向介质结构单元。该结构由对称两组镜框型金属结构组成,可同时获得负介电常数和负磁导率的双负特性。研究中对负磁导率进行了定性理论分析,并根据后向波理论,设计了通过场空间相位对后向波特性进行仿真验证的方法。 3)设计出一种单面蚀刻的二维各向同性电磁异向介质单元。首次提出场-路结合的等效源分析法以计算异向介质等效介电常数、磁导率,并据此对该结构单元的左手特性激发机理进行了论证。 4)将电磁异向介质应用于生物医学工程领域,利用电磁异向介质单负频段的阻带效应,设计并验证了一种降低人体对手机辐射吸收率的方案。
[Abstract]:Electromagnetic anisotropic medium has become one of the current research hotspots in electromagnetic engineering. By virtue of its unique "negative refraction characteristics", "backward wave characteristics" and other properties in solid state physics, material science, optics, applied electromagnetism, Biomedical engineering and other fields are widely favored. At present, the research on the electromagnetic anisotropic medium is mainly focused on the research of the anisotropic characteristics, the structure design of the dielectric element, the verification of the double negative characteristics and the application of the different medium. In this paper, based on the previous experience, two kinds of electromagnetic anisotropic media with excellent performance are designed and applied to biomedical engineering. The main work of this paper is as follows: 1) the construction principle of classical electromagnetic anisotropic medium is described in detail, and the cause of formation of negative dielectric constant and SRR structure of Rod array and negative permeability of counter ring resonator are introduced in detail. 2) an electromagnetic anisotropic dielectric element working in S band is proposed. The structure is composed of symmetrical two groups of mirror frame metal structures, and the negative permittivity and negative permeability can be obtained at the same time. In the research, the negative permeability is analyzed qualitatively, and according to the backward wave theory, a simulation method is designed to verify the characteristics of the backward wave through the phase of the field space. 3) A two dimensional isotropic electromagnetic anisotropic dielectric element with one side etching is designed. An effective source analysis method combining field and circuit is proposed for the first time in order to calculate the equivalent permittivity and permeability of the dissimilar medium, and the excitation mechanism of the left-handed characteristic of the structure element is demonstrated. 4) the electromagnetic anisotropic medium is applied to biomedical engineering field. A scheme to reduce the radiation absorption of mobile phone is designed and verified by using the band blocking effect of electromagnetic anisotropic medium in single negative frequency band.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.0
本文编号：2426494
[Abstract]:Electromagnetic anisotropic medium has become one of the current research hotspots in electromagnetic engineering. By virtue of its unique "negative refraction characteristics", "backward wave characteristics" and other properties in solid state physics, material science, optics, applied electromagnetism, Biomedical engineering and other fields are widely favored. At present, the research on the electromagnetic anisotropic medium is mainly focused on the research of the anisotropic characteristics, the structure design of the dielectric element, the verification of the double negative characteristics and the application of the different medium. In this paper, based on the previous experience, two kinds of electromagnetic anisotropic media with excellent performance are designed and applied to biomedical engineering. The main work of this paper is as follows: 1) the construction principle of classical electromagnetic anisotropic medium is described in detail, and the cause of formation of negative dielectric constant and SRR structure of Rod array and negative permeability of counter ring resonator are introduced in detail. 2) an electromagnetic anisotropic dielectric element working in S band is proposed. The structure is composed of symmetrical two groups of mirror frame metal structures, and the negative permittivity and negative permeability can be obtained at the same time. In the research, the negative permeability is analyzed qualitatively, and according to the backward wave theory, a simulation method is designed to verify the characteristics of the backward wave through the phase of the field space. 3) A two dimensional isotropic electromagnetic anisotropic dielectric element with one side etching is designed. An effective source analysis method combining field and circuit is proposed for the first time in order to calculate the equivalent permittivity and permeability of the dissimilar medium, and the excitation mechanism of the left-handed characteristic of the structure element is demonstrated. 4) the electromagnetic anisotropic medium is applied to biomedical engineering field. A scheme to reduce the radiation absorption of mobile phone is designed and verified by using the band blocking effect of electromagnetic anisotropic medium in single negative frequency band.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.0
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