本文關鍵詞： 左手材料 二維 陣列結構 寬頻帶　出處：《杭州電子科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：左手材料是一類新型人工構造的電磁材料,具有特異的電磁性能,在一定的頻率范圍內同時具有負的介電常數ε和負的磁導率?,對電磁波的傳播形成負折射率。這種材料的奇異特性能夠在微波、天線、射頻和光學等領域發(fā)揮重要的作用。作為一種人工材料,左手材料的制備通常在一般媒質中嵌入設計的幾何諧振結構,組合形成天然媒質不具有的電磁特性。本文圍繞左手材料的設計,提出了一種新型矩形陣列結構左手材料,具有二維各向同性、頻帶高適應性等優(yōu)點,并研究了所設計結構的參數與材料的電磁特性之間關系。論文的主要工作有:1、詳細闡述了左手材料的研究背景及其基本特性,通過復現驗證經典的Smith結構,介紹和驗證了左手材料的建模、電磁仿真流程以及S參數法等效本構參數提取,研究了利用基于Kramers Kronig關系式改進參數反演算法解決傳統(tǒng)參數反演算法中選取折射率計算結果支路的算法缺陷。將算法公式在MATLAB程序中編程,計算出S參數數據分別對應的等效介電常數、等效磁導率、折射率和阻抗。2、設計了一種新型寬頻帶,低損耗二維雙面矩形陣列左手材料,可在兩個方向上產生各向同性的等效負介電常數和等效負磁導率。材料由兩種規(guī)格的矩形金屬片陣列蝕刻在FR4介質板兩面,結構簡單,易于加工,材料在二維方向上通帶帶寬達到6.4GHz。3、進一步研究了材料的結構尺寸與材料本構參數的關系。驗證了周期結構左手材料單元間距從1mm遞增到2mm,材料左手特性實現了2.3GHz的頻率偏移;驗證了構成左手材料結構的矩形金屬片的寬度分別增減0.4mm,實現左手特性0.8GHz的頻率偏移。進一步解決了目前左手材料頻帶窄,適應性差的缺點。4、對材料進行工業(yè)加工制備,通過波導-矢量網絡分析儀測量系統(tǒng)測試驗證制備材料的性能,將材料放置在波導內,通過同軸線連接矢量網絡分析儀提取出材料S參數,進一步反演參數驗證了材料的左手特性。本文的研究為左手材料的應用提供了一種易于加工,高性能,頻帶高適應性的可行性方案。
[Abstract]:Left-handed material is a new type of artificial electromagnetic material with special electromagnetic properties. It has negative permittivity 蔚 and negative permeability in a certain frequency range at the same time. The singular properties of this material can play an important role in the fields of microwave, antenna, radio frequency and optics. The preparation of left-handed materials is usually embedded in a general medium with a geometric resonant structure, which combines to form electromagnetic properties that natural media do not have. A new type of left-handed material with rectangular array structure is proposed around the design of left-handed materials in this paper. It has the advantages of two-dimensional isotropy, high adaptability in frequency band, and studies the relationship between the parameters of the designed structure and the electromagnetic properties of the material. The main work of this paper is: 1. The research background and basic characteristics of left-handed materials are described in detail. The classical Smith structure is verified by reproducing, and the modeling of left-handed material, electromagnetic simulation flow and the extraction of equivalent constitutive parameters by S-parameter method are introduced and verified. An improved parameter inversion algorithm based on Kramers Kronig relation is proposed to solve the problem of selecting the branch of refractive index calculation in the traditional parameter inversion algorithm. The algorithm formula is programmed in MATLAB program. The corresponding equivalent permittivity, equivalent permeability, refractive index and impedance of S parameter data are calculated respectively. A novel broadband, low-loss two-dimensional two-sided rectangular array left-handed material is designed. Isotropic equivalent negative permittivity and equivalent negative permeability can be produced in two directions. The material is etched on both sides of the FR4 dielectric plate by two kinds of rectangular metal sheet arrays. In the two-dimensional direction, the passband bandwidth reaches 6.4 GHz 路3. The relationship between the structure size and the constitutive parameters of the material is further studied. It is verified that the cell spacing of the left-handed material increases from 1 mm to 2 mm, and the left-handed characteristic of the material achieves a frequency shift of 2.3 GHz. It is verified that the width of rectangular metal sheet composed of left-handed material structure increases or decreases by 0.4mm respectively, and the frequency offset of left-handed characteristic of 0.8GHz is realized. Further, the defect of narrow band and poor adaptability of left-handed material is solved, and the material is manufactured by industrial processing. The properties of the prepared materials were tested by the wave-vector network analyzer system. The materials were placed in the waveguide and the S parameters were extracted by the coaxial vector network analyzer. Further inversion parameters verify the left-handed properties of the material. This study provides a feasible scheme for the application of left-handed materials, which is easy to process, high performance and high adaptability in frequency band.
【學位授予單位】：杭州電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM27

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