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Title: | 基於微波表面電漿之平面型子波長開放式導波結構 A Planar and Subwavelength Open Guided Wave Structure Based on Spoof Surface Plasmons |
Authors: | Liang-Yu Ou Yang 歐陽良昱 |
Advisor: | 陳士元(Shih-Yuan Chen) |
Keyword: | 導波結構,空間色散,微波表面電漿,單軸金屬帶線媒質, guided wave structures,spatial dispersion,spoof surface plasmon,uniaxial strip medium, |
Publication Year : | 2015 |
Degree: | 博士 |
Abstract: | 吾人展現一個基於微波表面電漿子的平面開放式導波結構。為了實作上的考量,吾人提出利用單軸金屬帶線媒質取代熟知的金屬導線媒質做為等效的負介電常數塊材以支持微波表面電漿子模態。一些相關的公式,包含微波表面電漿子的色散關係式與非等向性且空間色散介質的多層反射-透射公式都被提出。值得一提的是,不像過去大部分文獻均嘗試抑制空間色散,對於吾人提出的結構,空間色散效應不僅可增強表面電漿子模態場的局限能力達41%,況且,單軸金屬帶線平板可透過在其背面貼上金屬以減少50%的板厚,並且不干擾表面電漿子的反對稱模態分布。此方法和空間色散可用來避免在多層電路板結構中元件的電磁干擾和縮小微波表面電漿感測器與表面波導。吾人完成兩個實驗以驗證理論計算與模擬。第一個實驗展示微波表面電漿模態的存在,且提出的結構其厚度達子波長等級。此外,對於這樣的慢波結構其傳播損耗很少被定量討論,在本論文中,透過理論計算和模擬,闡明吾人提出的結構其表面電漿子模態傳播損耗是非常低的。在第二個實驗中,吾人再次驗證所預測的微波表面電漿模態其存在性,也展示實際的模態傳輸特性。實驗結果表明微波表面電漿效應可以增強一個收發機系統的傳輸效率。 A planar and compact open waveguiding structure based on spoof surface plasmon polaritons (SPPs) was demonstrated. For practicality, instead of the well-known wire medium, the uniaxial strip medium (USM) was proposed and used as the effective bulk material with a negative dielectric constant to support the spoof SPP modes. The relevant formulations, including the modal dispersion relations and the formulation for the waves in a multilayer anisotropic spatially dispersive structure, are analytically presented in this thesis. Interestingly, instead of taming and suppressing the spatial dispersion (SD), which had been done in most past studies, SD was exploited in the proposed structure to enhance the field confinement of the spoof SPP mode by approximately 41%. Moreover, the thickness of the USM slab could be reduced by 50% using conductor backing and without perturbing the odd mode. This method and SD can help avoid electromagnetic interactions among various components of a multilayer printed circuit board (PCB) structure and help miniaturize sensors or surface-wave waveguides in the microwave regime. Two experiments were conducted to verify the theoretical calculations and simulations. The first experiment is designed to demonstrate the presence of the spoof SPP modes and the thickness of the proposed structure is in subwavelength order. Additionally, the propagation loss for such slow-wave structures has seldom been discussed analytically and quantitatively. In this thesis, through calculations and simulations, low attenuation constants in the spoof SPP propagation direction of the proposed structures were investigated. In the second experiment, the existence of the predicted spoof SPP is again confirmed and the practical transmission performance is demonstrated. The results show that the spoof SPP can enhance the transmission efficiency between a transmitter and receiver system. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/53978 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 電信工程學研究所 |
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ntu-104-1.pdf Restricted Access | 2.58 MB | Adobe PDF |
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