Design Of Metamaterials And Application In Biomedicine

Metamaterial has become one of hot topics of electromagnetic research. With its unique "negative refraction", "backward wave" and the other properties, metamaterials are widely utilized in many fields, such as solid-state physics, material science, optics, biomedicine and applied electromagnetic. Currently the main research on metamaterials mostly focuses on the following aspects:the electromagnetic properties of the metamaterial, the realization of the metamaterial, the experimental verification of the metamaterial, and the application of metamaterial. Based on the previous experience, two kinds of metamaterials are designed in this thesis first. Then, one of them is applied to the biomedicine field.The main work and creative points of the thesis can be summarized as bellows:1) The classical metamaterial structure principle is studied in detail. Meanwhile, the reason for negative permittivity of Rod array and negative permeability of SRR & SRR array is introduced and summarized.2) A new metamaterial unit is proposed by setting two reverse symmetrical metal strips on each side of the dielectric substrate respectively. Then, double-negative properties are presented in S waveband by the single structure. The reason for negative permeability of the structure is formulated. Based on "backward wave" theory, a new verification method is designed.3) A new two-dimensional isotropic metamaterial unit only needed to etch on one side of the dielectric substrate is designed. And a new analysis method which is based on combining field and circuit is proposed to analyze the effective electromagnetic properties.4) The material is used to get band stop effect due to its single-negative band. The metamaterial is used in the field of biomedicine and the absorption rate of mobile phone radiation is reduced on the human body.