本文關(guān)鍵詞：新型電磁超材料的微波工程應(yīng)用關(guān)鍵技術(shù)研究　出處：《電子科技大學(xué)》2016年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 電磁超材料 電磁超介質(zhì)吸波材料 電磁波相干原理 單極子天線 鐵氧體 磁各向異性 可調(diào)諧 超高頻射頻識(shí)別

【摘要】：電磁超材料(Electromagnetic Metamaterial)是一種人工合成的具有奇異電磁特性的結(jié)構(gòu)型材料,其中等效介電常數(shù)和磁導(dǎo)率同時(shí)為負(fù)時(shí)又稱之為負(fù)折射率媒質(zhì)、左手材料等。這類電磁超材料具有的奇異電磁特性包括負(fù)折射現(xiàn)象、逆多普勒頻移、逆切倫科夫輻射、負(fù)光壓現(xiàn)象等。由于構(gòu)成電磁超材料的機(jī)理和物理尺寸的形式多樣,以及所具有顛覆經(jīng)典物理認(rèn)識(shí)的獨(dú)特性質(zhì),電磁超材料在聲學(xué)、電磁學(xué)、光學(xué)等物理領(lǐng)域具有重要的研究價(jià)值。同時(shí),基于電磁超材料獨(dú)特的控制電磁波傳播、反射、散射的巨大能力,其在射頻/微波/毫米波無線通信,以及光學(xué)通信等工程領(lǐng)域具有極其重要的應(yīng)用前景。其中,基于電磁超材料的微波工程應(yīng)用研究吸引了國內(nèi)外眾多學(xué)者的研究興趣。因此,這一研究分支也得到了快速的發(fā)展,并獲得了許多重要的研究成果。但是,隨著各種結(jié)構(gòu)電磁超材料的相繼提出,其在微波工程領(lǐng)域的應(yīng)用途徑以及性能指標(biāo)等也在快速的被更新和趕超。本學(xué)位論文在新型電磁超材料設(shè)計(jì)研制的基礎(chǔ)上,為了實(shí)現(xiàn)新型電磁超材料的應(yīng)用拓展,以及在現(xiàn)有應(yīng)用基礎(chǔ)上的性能改進(jìn),深入的研究了具有不同介質(zhì)厚度情況下電磁超介質(zhì)吸波材料的吸波性能、基于新型電磁超材料單元的多頻天線、基于鐵氧體媒質(zhì)的新型超高頻射頻識(shí)別閱讀器天線等內(nèi)容,具體如下：1.深入研究了基于電磁超材料的電磁吸波材料(稱之為電磁超介質(zhì)吸波材料)在不同介質(zhì)厚度情況下的吸波性能及變化特性。首先,通過對比電磁超介質(zhì)吸波材料的幾種理論分析方法的優(yōu)缺點(diǎn),選擇采用電磁波相干原理,并結(jié)合電磁仿真方法,研究了可工作在微波和THz波段的電磁超介質(zhì)吸波材料的吸波性能,以及在不同介質(zhì)厚度情況下吸波性能的變化特性。然后,重點(diǎn)研究了電磁超介質(zhì)吸波材料在介質(zhì)厚度為入射電磁波的1/2波長和一個(gè)波長時(shí)的吸波率可重復(fù)特性。同時(shí),研究了電磁超介質(zhì)吸波材料具有的高階吸波特性,以及高階吸波特性同樣具有的周期重復(fù)特性。最后,深入研究了電磁超介質(zhì)吸波材料中金屬諧振環(huán)、介質(zhì)材料、金屬背板在吸收入射電磁波能量中所起的作用。研究得出金屬電諧振環(huán)以及靠近金屬諧振環(huán)部分的介質(zhì)材料對吸收入射電磁波的能量起決定性作用,電磁超介質(zhì)吸波材料中金屬背板主要是起反射入射電磁波的功能。2.系統(tǒng)研究了基于多頻電磁超材料單元的新型小型化平面單極子天線。首先,研究了矩形和圓形金屬諧振環(huán)結(jié)構(gòu)的諧振頻率特性和負(fù)磁導(dǎo)率特性。接著設(shè)計(jì)出了基于具有不同形狀的多頻電磁超材料單元的多頻單極子天線；同時(shí),采用共面波導(dǎo)和微帶線兩種不同饋電方式,對比分析地研究了這類天線的阻抗匹配特性和遠(yuǎn)場輻射性能。最后,通過加工出工程樣品,并采刖商用天線測量系統(tǒng),實(shí)驗(yàn)研究了這類單極子天線的遠(yuǎn)場輻射特性,并與仿真結(jié)果進(jìn)行了對比研究,分析其中存在的誤差問題和可能的解決途徑。結(jié)果顯示這類電磁超材料加載的單極子天線具有結(jié)構(gòu)緊湊、能多頻工作、能獨(dú)立控制其工作頻率等獨(dú)特優(yōu)點(diǎn),可廣‘泛應(yīng)朋于射頻/微波無線通信終端設(shè)備中。3.基于在外加偏置磁場作用下具有磁各向異性以及具有等效的單負(fù)磁導(dǎo)率特性的鐵氧體材料,提出了一種可覆蓋所有國家/地區(qū)標(biāo)準(zhǔn)的超高頻射頻識(shí)別閱讀器圓極化微帶天線設(shè)計(jì)思路。通過理論分析基于鐵氧體的微帶天線產(chǎn)生圓極化的機(jī)理,以及其工作頻率隨外加磁場強(qiáng)度變化時(shí)產(chǎn)生頻移特性的原理,深入研究了這種天線用于超高頻射頻識(shí)別閱讀器的可行性和優(yōu)越性。最后通過數(shù)值分析的方法驗(yàn)證了設(shè)計(jì)的正確性。結(jié)果顯示這種鐵氧體加載的新型微帶天線能在非常寬的頻率范圍內(nèi)容易地實(shí)現(xiàn)圓極化輻射特性。通過對上述三個(gè)主要研究點(diǎn)的深入研究,本學(xué)位論文獲得了微波和THz波段具有不同介質(zhì)厚度的電磁超介質(zhì)吸波材料的吸波特性,并通過電磁波相干原理解釋了其出現(xiàn)重復(fù)吸波特性的本質(zhì)原因,進(jìn)一步探討獲得了電磁超介質(zhì)吸波材料中各部件對入射電磁波能量消耗所起的作用；采用多頻電磁超材料諧振單元加載的方式,獲得了多種緊湊型的平面單極子天線；最后利用鐵氧體加載的方式獲得了可覆蓋所有國家/地區(qū)標(biāo)準(zhǔn)的超高頻射頻識(shí)別閱讀器圓極化微帶天線設(shè)計(jì)思路。這些新設(shè)計(jì)出的電磁超介質(zhì)吸波材料和天線,促進(jìn)了電磁超材料技術(shù)在通信和電子工程領(lǐng)域的快速應(yīng)用推廣,具有重要科學(xué)意義。
[Abstract]:Electromagnetic metamaterials (Electromagnetic Metamaterial) is a synthetic type structure with special electromagnetic properties of materials, the equivalent permittivity and permeability are simultaneously negative is called a negative refractive index, the left hand material. This kind of singular electromagnetic characteristics of metamaterials which include negative refraction, inverse Doppler frequency shift, inverse Cherenkov radiation, negative pressure phenomenon. The mechanism and physical dimensions of electromagnetic metamaterials in various forms, and has unique properties to subvert the classic knowledge of physics, electromagnetic metamaterials in acoustics, electromagnetics, optics has important research value and other physical fields. At the same time, reflecting the electromagnetic wave, electromagnetic based on the unique materials, great ability of scattering in RF / microwave / millimeter wave wireless communication, and has very important application prospect and optical communication fields. Among them Study on engineering application of microwave, electromagnetic metamaterials have attracted many scholars at home and abroad based on. Therefore, this research branch has got rapid development and obtained many important results. However, with various structures of electromagnetic metamaterials have been proposed. The application in the field of microwave engineering and performance index in the rapid update and catching up. This thesis based on new metamaterials designed, in order to expand the application of new type electromagnetic metamaterials, and performance based on the existing application on improvement, in-depth research with the absorbing properties of different media under the condition that the thickness of metamaterial absorber the multi frequency antenna electromagnetic metamaterial unit based on ferrite medium model of UHF RFID reader antenna etc., based on the in-depth study of the specific as follows: 1. Electromagnetic wave absorbing materials based on metamaterials (called metamaterials absorbing material) wave absorption properties and characteristics in different medium thickness conditions. Firstly, by comparing the advantages and disadvantages of metamaterials absorbing wave material theory analysis methods, choice of using the electromagnetic wave coherent principle, combining with electromagnetic simulation the method of electromagnetic wave absorbing performance, can work in the microwave and THz band metamaterial absorber, and absorbing properties in different media under the condition that the thickness variation characteristics. Then, focuses on the research of metamaterials absorbing materials in medium thickness is 1/2 the wavelength of the incident electromagnetic wave with a wavelength. The absorbing rate of repeatable characteristics. At the same time, the study of metamaterials absorbing materials with high order wave absorbing characteristics, and the cycle of high order suction also has wave characteristics of repetitive characteristics. Finally, in-depth study of the metamaterial absorption The metal ring resonant wave material, dielectric material, metal back in the role of the energy absorption of incident electromagnetic waves in the dielectric material. The results of metal electrical resonant ring and close to the metal ring resonator part plays a decisive role in the absorption of incident electromagnetic wave energy, metamaterials absorbing wave material of metal backboard is mainly studied miniaturized planar monopole antenna multi frequency electromagnetic metamaterial unit based on the reflection of the incident electromagnetic wave function of.2. system. Firstly, study the characteristics of resonant frequency of rectangular and circular metal ring resonator structure and negative permeability. Then design a multi frequency monopole antenna multi frequency electromagnetic metamaterial unit with different shapes at the same time, based on; with coplanar waveguide and microstrip line two different feeding mode, comparative analysis on the impedance matching of the antenna and the characteristics of the far field radiation performance. Finally, Through the processing of engineering samples, and measuring system 2 commercial antenna far-field radiation characteristics were studied this kind of monopole antenna, and compare with the simulation results, the error analysis of existing problems and possible solutions. The results showed that this kind of monopole antenna electromagnetic metamaterial loaded with compact structure can work, multi frequency, can independently control the working frequency of the unique advantages, can be widely friends in RF / microwave wireless communication terminal equipment based on.3. ferrite single negative permeability properties with magnetic anisotropy and has the effect of bias magnetic field under the action of external, a cover all countries / regions standard UHF RFID reader circular polarization microstrip antenna design. Through theoretical analysis of the generation mechanism of circular polarization microstrip antenna based on ferrite, and its working frequency The principle of frequency shift characteristics with magnetic field changes, in-depth study of the feasibility and superiority of this antenna for UHF RFID reader. Finally through the numerical analysis method to verify the correctness of the design. The results showed that this kind of new ferrite loaded microstrip antenna can realize the radiation characteristics of circular polarization in the frequency range very wide easily. Through in-depth research on the three main point, electromagnetic wave absorbing properties in this thesis were obtained with microwave and THz bands with different thickness of the dielectric medium super absorbing material, and through the electromagnetic wave coherent principle to explain the substaintial cause repeated absorbing characteristics, further to investigate the electromagnetic metamaterials absorbing effect of the components of the incident electromagnetic wave absorbing materials are energy consumption; using multi frequency electromagnetic metamaterial resonant unit loading mode gain Planar monopole antenna multiple compact; finally obtained can cover all countries / regions standard UHF RFID reader antenna design using circular polarization microstrip ferrite loading mode. These new designed metamaterials absorbing material and antenna, promote the rapid application of metamaterial technology in the field of communication and electronic engineering, has important scientific significance.

【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN820

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本文編號(hào)：1431356