本文關(guān)鍵詞： 左手材料 二維 陣列結(jié)構(gòu) 寬頻帶　出處：《杭州電子科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：左手材料是一類新型人工構(gòu)造的電磁材料,具有特異的電磁性能,在一定的頻率范圍內(nèi)同時(shí)具有負(fù)的介電常數(shù)ε和負(fù)的磁導(dǎo)率?,對(duì)電磁波的傳播形成負(fù)折射率。這種材料的奇異特性能夠在微波、天線、射頻和光學(xué)等領(lǐng)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(zhì)中嵌入設(shè)計(jì)的幾何諧振結(jié)構(gòu),組合形成天然媒質(zhì)不具有的電磁特性。本文圍繞左手材料的設(shè)計(jì),提出了一種新型矩形陣列結(jié)構(gòu)左手材料,具有二維各向同性、頻帶高適應(yīng)性等優(yōu)點(diǎn),并研究了所設(shè)計(jì)結(jié)構(gòu)的參數(shù)與材料的電磁特性之間關(guān)系。論文的主要工作有:1、詳細(xì)闡述了左手材料的研究背景及其基本特性,通過復(fù)現(xiàn)驗(yàn)證經(jīng)典的Smith結(jié)構(gòu),介紹和驗(yàn)證了左手材料的建模、電磁仿真流程以及S參數(shù)法等效本構(gòu)參數(shù)提取,研究了利用基于Kramers Kronig關(guān)系式改進(jìn)參數(shù)反演算法解決傳統(tǒng)參數(shù)反演算法中選取折射率計(jì)算結(jié)果支路的算法缺陷。將算法公式在MATLAB程序中編程,計(jì)算出S參數(shù)數(shù)據(jù)分別對(duì)應(yīng)的等效介電常數(shù)、等效磁導(dǎo)率、折射率和阻抗。2、設(shè)計(jì)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(gè)方向上產(chǎn)生各向同性的等效負(fù)介電常數(shù)和等效負(fù)磁導(dǎo)率。材料由兩種規(guī)格的矩形金屬片陣列蝕刻在FR4介質(zhì)板兩面,結(jié)構(gòu)簡單,易于加工,材料在二維方向上通帶帶寬達(dá)到6.4GHz。3、進(jìn)一步研究了材料的結(jié)構(gòu)尺寸與材料本構(gòu)參數(shù)的關(guān)系。驗(yàn)證了周期結(jié)構(gòu)左手材料單元間距從1mm遞增到2mm,材料左手特性實(shí)現(xiàn)了2.3GHz的頻率偏移;驗(yàn)證了構(gòu)成左手材料結(jié)構(gòu)的矩形金屬片的寬度分別增減0.4mm,實(shí)現(xiàn)左手特性0.8GHz的頻率偏移。進(jìn)一步解決了目前左手材料頻帶窄,適應(yīng)性差的缺點(diǎn)。4、對(duì)材料進(jìn)行工業(yè)加工制備,通過波導(dǎo)-矢量網(wǎng)絡(luò)分析儀測量系統(tǒng)測試驗(yàn)證制備材料的性能,將材料放置在波導(dǎo)內(nèi),通過同軸線連接矢量網(wǎng)絡(luò)分析儀提取出材料S參數(shù),進(jìn)一步反演參數(shù)驗(yàn)證了材料的左手特性。本文的研究為左手材料的應(yīng)用提供了一種易于加工,高性能,頻帶高適應(yīng)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(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM27

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