本文選題：電磁超材料 + 亞波長(zhǎng)��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：電磁超材料(Metamaterial)作為一種具有許多常規(guī)媒質(zhì)不具備的奇異特性的人工媒質(zhì)，受到了越來(lái)越廣泛的關(guān)注。本文根據(jù)電磁超材料的設(shè)計(jì)理論，設(shè)計(jì)了高度亞波長(zhǎng)小型化的單負(fù)、雙負(fù)電磁超材料，并將其應(yīng)用于無(wú)線能量傳輸系統(tǒng)中，提高無(wú)線能量傳輸?shù)木嚯x和效率；又從理論方面入手，研究不同種類(lèi)理想近零折射率材料的等效媒質(zhì)特性，并將其用于構(gòu)成高指向性天線的覆層，研究其對(duì)天線性能的影響；最后用實(shí)際拓?fù)浣Y(jié)構(gòu)實(shí)現(xiàn)了幾種近零折射率電磁超材料，并作為覆層與微帶天線構(gòu)成高增益覆層天線，研究其對(duì)微帶天線性能的改善。 本文的主要工作和研究成果包括以下方面： 首先，設(shè)計(jì)了一種兩面均為平面螺旋結(jié)構(gòu)的磁導(dǎo)率為負(fù)（MNG）電磁超材料，其波長(zhǎng)和尺寸比大于307，具有亞波長(zhǎng)小型化的特點(diǎn)；又基于MNG電磁超材料的設(shè)計(jì)方法設(shè)計(jì)了一種一面為平面螺旋、一面為金屬?gòu)澱劬�的雙負(fù)（DNG或NRI）電磁超材料，其波長(zhǎng)與尺寸之比大于253，也具有高度小型化的特征，且根據(jù)此種電磁超材料的結(jié)構(gòu)特征提出一種簡(jiǎn)易的測(cè)量方法。 其次，將所設(shè)計(jì)的MNG、NRI電磁超材料應(yīng)用于無(wú)線能量傳輸系統(tǒng)中，用兩個(gè)耦合環(huán)集成一塊、兩塊、三塊及四塊MNG或NRI電磁超材料單元構(gòu)成新型無(wú)線能量傳輸系統(tǒng)，此系統(tǒng)工作于磁諧振耦合機(jī)制，當(dāng)兩個(gè)耦合環(huán)間距離為140mm時(shí)，集成三塊電磁超材料單元的傳輸系統(tǒng)與只有兩個(gè)耦合環(huán)組成的無(wú)線能量傳輸系統(tǒng)相比，其傳輸系數(shù)S21從-32.4dB增加到-5.1dB，提高了27.3dB。 第三，從理論方面入手，研究了幾種近零折射率材料的等效媒質(zhì)特性，研究發(fā)現(xiàn)，對(duì)于由介電常數(shù)近零（ENZ）的近零折射率材料不完全填充的一個(gè)區(qū)域而言，其E面電場(chǎng)主要通過(guò)近零折射率材料來(lái)傳輸；而對(duì)由磁導(dǎo)率近零（MNZ）的近零折射率材料不完全填充的一個(gè)區(qū)域而言，其H面磁場(chǎng)主要通過(guò)近零折射率材料來(lái)傳輸；而對(duì)于由介電常數(shù)和磁導(dǎo)率雙近零（DNZ）的近零折射率材料不完全填充的一個(gè)區(qū)域而言，其E面電場(chǎng)和H面的磁場(chǎng)都主要通過(guò)近零折射率材料來(lái)傳輸；將理想近零折射率材料用作微帶天線的覆層構(gòu)成高指向性天線，ENZ近零折射率材料的覆層將對(duì)天線的E面方向圖進(jìn)行壓縮匯聚，MNZ近零折射率材料的覆層將對(duì)天線H面方向圖進(jìn)行壓縮匯聚，而DNZ近零折射率材料將對(duì)E面和H面方向圖同時(shí)進(jìn)行壓縮匯聚，因此方向性提高。 第四，用實(shí)際拓?fù)浣Y(jié)構(gòu)實(shí)現(xiàn)了幾種近零折射率電磁超材料，將其應(yīng)用于高增益覆層天線，實(shí)測(cè)與理論研究吻合良好；在基板的一面刻蝕Fishnet嵌套方形貼片結(jié)構(gòu)，另一面刻蝕Fishnet結(jié)構(gòu)將使電磁超材料的相對(duì)介電常數(shù)和相對(duì)磁導(dǎo)率同時(shí)近零，，因此實(shí)際增益有6.8dB的提高。
[Abstract]:As a kind of artificial medium, electromagnetic metamaterial has attracted more and more attention. According to the design theory of electromagnetic supermaterial, single negative and double negative electromagnetic supermaterials with high subwavelength miniaturization are designed and applied to wireless energy transmission system to improve the distance and efficiency of wireless energy transmission. From the theoretical point of view, the equivalent media characteristics of different kinds of ideal near-zero refractive index materials are studied, and used to form the coating layer of high directivity antenna, and the effect on antenna performance is studied. Finally, several kinds of near-zero refractive index electromagnetic supermaterials are realized by using the actual topology, and used as a cladding and microstrip antenna to form a high gain coated antenna. The improvement of the performance of the microstrip antenna is studied. The main work and research results of this paper include the following aspects: Firstly, a kind of magnetic supermaterial with both plane helical structure and negative magnetic permeability is designed. The ratio of wavelength to size is larger than 307 and has the characteristic of subwavelength miniaturization. Based on the design method of MNG electromagnetic supermaterial, a double negative DNG or NRI electromagnetic supermaterial with a plane spiral and a metal bending line is designed. The ratio of wavelength to size is larger than 253, and it also has the characteristics of high miniaturization. According to the structural characteristics of the electromagnetic supermaterial, a simple measurement method is proposed. Secondly, the designed MNGNRI electromagnetic supermaterial is applied to the wireless energy transmission system. Two coupling loops are integrated into one piece, two pieces, three blocks and four MNG or NRI electromagnetic supermaterial units to form a new wireless energy transmission system. The system works on the magnetic resonance coupling mechanism. When the distance between the two coupling rings is 140mm, the transmission system which integrates three electromagnetic supermaterial elements is compared with the wireless energy transmission system which consists of only two coupling loops. The transmission coefficient S21 was increased from -32.4dB to -5.1dB, which increased 27.3 dB. Thirdly, the equivalent media properties of several near-zero refractive index materials are studied theoretically. It is found that for a region not fully filled with near-zero refractive index materials with dielectric constant near zero, The E-plane electric field is mainly transmitted by near-zero refractive index material, while for a region not filled with near-zero refractive index material with permeability near zero, the H-plane magnetic field is mainly transmitted by near-zero refractive index material. For a region that is not completely filled with near-zero refractive index material with both permittivity and permeability, the electric field on E plane and magnetic field on H plane are mainly transmitted by near-zero refractive index material. Using ideal Near-Zero Refractive Index material as coating of microstrip Antenna to form a High directivity Antenna ENZ Near-Zero Refractive Index material Coatings will compress and converge the E plane pattern of the Antenna; MNZ Near-Zero Refractive Index material coating will be applied to the antenna H The plane pattern is compressed and converged. The near-zero refractive index material of DNZ will compress and converge the patterns of E plane and H plane at the same time, so the directivity is improved. Fourthly, several kinds of near-zero refractive index electromagnetic supermaterials are realized by using practical topology, which are applied to high gain cladding antennas. The measured results are in good agreement with the theoretical study, and the Fishnet nested square patch structure is etched on one side of the substrate. Etching the Fishnet structure on the other side will make the relative permittivity and relative permeability of the electromagnetic supermaterial near zero at the same time, so the actual gain is increased with the increase of 6.8dB.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN820

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 周航;裴志斌;彭衛(wèi)東;柏鵬;張介秋;屈紹波;;零折射率超材料對(duì)喇叭天線波前相位的改善[J];空軍工程大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年06期

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