本文選題：電磁超材料 + 亞波長��； 參考：《西安電子科技大學》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)媒質不具備的奇異特性的人工媒質，受到了越來越廣泛的關注。本文根據電磁超材料的設計理論，設計了高度亞波長小型化的單負、雙負電磁超材料，并將其應用于無線能量傳輸系統(tǒng)中，提高無線能量傳輸的距離和效率；又從理論方面入手，研究不同種類理想近零折射率材料的等效媒質特性，并將其用于構成高指向性天線的覆層，研究其對天線性能的影響；最后用實際拓撲結構實現(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成高增益覆層天線，研究其對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，設計了一種兩面均為平面螺旋結構的磁導率為負（MNG）電磁超材料，其波長和尺寸比大于307，具有亞波長小型化的特點；又基于MNG電磁超材料的設計方法設計了一種一面為平面螺旋、一面為金屬彎折線的雙負（DNG或NRI）電磁超材料，其波長與尺寸之比大于253，也具有高度小型化的特征，且根據此種電磁超材料的結構特征提出一種簡易的測量方法。 其次，將所設計的MNG、NRI電磁超材料應用于無線能量傳輸系統(tǒng)中，用兩個耦合環(huán)集成一塊、兩塊、三塊及四塊MNG或NRI電磁超材料單元構成新型無線能量傳輸系統(tǒng)，此系統(tǒng)工作于磁諧振耦合機制，當兩個耦合環(huán)間距離為140mm時，集成三塊電磁超材料單元的傳輸系統(tǒng)與只有兩個耦合環(huán)組成的無線能量傳輸系統(tǒng)相比，其傳輸系數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特性，研究發(fā)現(xiàn)，對于由介電常數近零（ENZ）的近零折射率材料不完全填充的一個區(qū)域而言，其E面電場主要通過近零折射率材料來傳輸；而對由磁導率近零（MNZ）的近零折射率材料不完全填充的一個區(qū)域而言，其H面磁場主要通過近零折射率材料來傳輸；而對于由介電常數和磁導率雙近零（DNZ）的近零折射率材料不完全填充的一個區(qū)域而言，其E面電場和H面的磁場都主要通過近零折射率材料來傳輸；將理想近零折射率材料用作微帶天線的覆層構成高指向性天線，ENZ近零折射率材料的覆層將對天線的E面方向圖進行壓縮匯聚，MNZ近零折射率材料的覆層將對天線H面方向圖進行壓縮匯聚，而DNZ近零折射率材料將對E面和H面方向圖同時進行壓縮匯聚，因此方向性提高。 第四，用實際拓撲結構實現(xiàn)了幾種近零折射率電磁超材料，將其應用于高增益覆層天線，實測與理論研究吻合良好；在基板的一面刻蝕Fishnet嵌套方形貼片結構，另一面刻蝕Fishnet結構將使電磁超材料的相對介電常數和相對磁導率同時近零，，因此實際增益有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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN820

【參考文獻】

相關期刊論文 前1條

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

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