本文選題：菲涅爾波帶透鏡 + 人工超材料�。� 參考：《電子科技大學》2017年碩士論文

【摘要】：菲涅爾波帶透鏡在方向圖控制性能上有著優(yōu)秀的表現,并且由于其制作簡易和成本低廉的優(yōu)勢備受市場青睞,針對菲涅爾波帶透鏡的研究在國內外一直是一個極具發(fā)展前景的科研方向。菲涅爾波帶透鏡在傳統(tǒng)介質材料透鏡領域理論發(fā)展已經十分成熟,現在對菲涅爾波帶透鏡的研究主流方式是和人工超材料和半導體等新型材料領域的結合應用。由于人工超材料的特殊電磁傳播性能,將人工超材料與菲涅爾波帶透鏡結合應用在方向圖控制上的科研工作取得了很好的成績,尤其是在高增益和波束掃描方向。該論文描述了結合菲涅爾波帶透鏡控制方向圖的兩種設計:可控超材料的菲涅爾波帶透鏡以及菲涅爾波帶透鏡與圓波導集成的波束天線。第一種設計基于常見的圓環(huán),“十”字和“工”字周期結構單元,利用在單層FR4介質板異面合成的方法設計篩選出圓環(huán)與“十”字的異面單元,該單元比較另一種異面單元體現出更好的電磁誘導透明效應,而且該單元周期結構的電磁諧振點隨著斜入射電磁波角度變化沒有改變,超材料介質的電磁透射性能的變化可以忽略不計。結合微波諧振器電路等效原理,在周期結構中加載電容,可以改變單元的電磁透射性能,加載不同容值電容,可以控制周期單元在3.5GHz處的電磁諧振點由透明諧振點向不透明諧振點轉換。結合利用偏置電壓控制容值在6.5pF—1.5pF變化的變容二極管,設計研制了周期性結構的電控制超材料菲涅爾波帶透鏡。經過實驗測試驗證,該人工超材料在3.5GHz處的透射性能在0V直流偏壓條件下為透射點,在7.1V直流偏壓下轉換為非透明點。利用該性能與菲涅爾波帶透鏡結合,改變波帶位置的超材料介質的透射性,實現了對標準偶極子天線的0度、10度、20度和30度的波束掃描。第二種設計是將圓波導與菲涅爾波帶透鏡集成的高方向性波束天線設計。利用對圓波導饋源阻抗匹配轉換的方法優(yōu)化波束天線的輻射效率,在30GHz處波束寬度僅為4.4度,方向增益達到22.5dBi,在30.5GHz處波束寬度5.7度,增益達到21.5dBi。該波束天線后續(xù)展望是在圓波導端設計成合適的圓極化器,實現波束天線的圓極化。
[Abstract]:Fresnel zone lens has excellent performance in pattern control, and is favored by the market because of its simplicity and low cost. The study of Fresnel zone lens has been a promising research direction at home and abroad. The theory of Fresnel zone lens has been developed in the field of traditional dielectric lens. Now the main research mode of Fresnel zone lens is the combination of artificial supermaterial and semiconductor and other new material fields. Due to the special electromagnetic propagation performance of artificial supermaterial, the application of artificial supermaterial and Fresnel band lens in pattern control has achieved good results, especially in the direction of high gain and beam scanning. This paper describes two designs of Fresnel band lens control pattern: a controllable supermaterial Fresnel band lens and a beam antenna which integrates the Fresnel band lens with a circular waveguide. The first design is based on the common circular ring, "ten" word and "industrial" word periodic structure unit, using the method of hetero-surface synthesis in the single-layer FR4 dielectric plate to design and screen the off-plane elements of the ring and the "ten" character. The element shows better electromagnetically induced transparency than another hetero-planar element, and the electromagnetic resonance point of the periodic structure of the cell does not change with the angle of oblique incident electromagnetic wave. The change of electromagnetic transmission property of metamaterials is negligible. Combined with the equivalent principle of microwave resonator circuit, the electromagnetic transmission performance of the unit can be changed by loading the capacitance in the periodic structure, and the capacitance with different values can be loaded. The transition from transparent resonance point to opaque resonance point can be controlled at 3.5 GHz. Combined with a varactor whose bias voltage is controlled at 6.5pF-1.5pF, an electrically controlled supermaterial Fresnel band lens with periodic structure is designed and developed. The experimental results show that the transmission performance of the artificial supermaterial at 3.5 GHz is a transmission point at 0 V DC bias and converted to a non-transparent point at 7.1 V DC bias. By combining the performance with the Fresnel band lens, the transmission of the metamaterial medium with changing the position of the band is obtained, and the beam scanning of the standard dipole antenna is realized at 0 ~ 10 ~ 10 ~ 20 ~ 20 and 30 ~ (th). The second design is a high directional beam antenna which integrates circular waveguide with Fresnel band lens. The radiation efficiency of the beam antenna is optimized by matching the impedance of the circular waveguide feed. The beam width is only 4.4 degrees at 30GHz, the directional gain is 22.5dBi. the beam width is 5.7 degrees at 30.5GHz and the gain is 21.5dBi. The future prospect of the beam antenna is to design a suitable circular polarizer at the end of the circular waveguide to realize the circular polarization of the beam antenna.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN820

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