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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 張宏鈞(Hung-Chun Chang) | |
| dc.contributor.author | Che-Lun Kuo | en |
| dc.contributor.author | 郭哲倫 | zh_TW |
| dc.date.accessioned | 2021-06-17T02:31:54Z | - |
| dc.date.available | 2018-08-24 | |
| dc.date.copyright | 2017-08-24 | |
| dc.date.issued | 2017 | |
| dc.date.submitted | 2017-08-17 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/68715 | - |
| dc.description.abstract | 時域有限差分法已被廣泛運用在諸多模擬光電電磁計算上，我們以C++語言，自行開發時域有限差分模擬器，並且具有平行化功能，透過訊息傳遞介面協定，利用多台電腦平行處理加速運算，以減少運算時間。
本論文主要分析並探討金屬跟非金屬結構的奈米天線的遠場性質及其表現 差異，並專注在八木宇田天線的相關結構上。非金屬因為損耗性遠比金屬低，逐漸地受到了注目；八木宇田天線以強大的指向性為特點，但傳統八木宇田天線卻有著體積過大的缺陷導致應用受限。而奈米結構本身體積足夠小，可充分克服傳統八木宇田的問題。我們主要用寬頻點波源來取代平常用的平面波來凸顯其方向性的特點。我們分析球狀奈米天線，並比較金屬跟非金屬的差異，且將金屬結構置於基板上以增加實用性。之後還探討圓柱棍狀的八木宇田奈米天線，可以看到更進一步的方向性增強。 | zh_TW |
| dc.description.abstract | The finite-difference time-domain method (FDTD) has been widely used in computational electromagnetics. We developed a parallelized three-dimensional (3-D) FDTD simulator in C++ language. The message passing interface (MPI) protocol is applied to our simulator for parallelizing several computers in the computation in order to speed up the process and shorten the simulation time.
In this research, the main topic is to analyze the far-field properties of metallic and all-dielectric nano-antennas, and we focus on Yagi-Uda type structures. Due to low loss, the all-dielectric nano-antennas have earned much attention recently. Yagi-Uda antennas possess high directivity, however the large size of their structure is a major drawback. Yagi-Uda nano-antennas have relatively small size, thus it can avoid the size drawback. In this research, the wave source is a broadband single emitter. We analyze nano-antennas and discuss the difference between all-dielectric and metallic structures. Considering practical applications, we also study the Yagi-Uda nano-antennas on substrate. On the other hand, the Cylindrical-Rod Yagi-Uda nano-antennas are also investigated in this thesis. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T02:31:54Z (GMT). No. of bitstreams: 1 ntu-106-R03942093-1.pdf: 6610589 bytes, checksum: d433834c84c3f2f49e5e71064e5d771a (MD5) Previous issue date: 2017 | en |
| dc.description.tableofcontents | 致謝..I
摘要..II ABSTRACT..III LIST OF FIGURES..VI Chapter 1 Introduction..1 1.1 Motivation .. 1 1.2 Introduction to Computational Electromagnetics .. 2 1.3 Chapter Outline .. 3 Chapter 2 The Finite-Difference Time-Domain Method ..5 2.1 The Yee Algorithm and Update Equation .. 5 2.2 The Courant Stability Limit .. 7 2.3 Dispersive Materials Model .. 8 2.3.1 The Drude Model .. 8 2.3.2 The Lorentz Model .. 10 2.3.3 The Auxiliary Differential Equation (ADE) Method .. 11 2.4 The Total-field / Scatter-field Technique .. 13 2.5 Convolutional Perfectly Matched Layer (CPML) .. 14 2.6 Periodic Boundary Conditions (PBCs) .. 16 2.7 Parallelized FDTD Method .. 16 2.8 Verification of Some FDTD Simulation Cases .. 18 2.8.1 Verification for 2-D Circular Cylinders .. 19 2.8.2 Verification for 3-D Silver Sphere .. 20 2.9 Validation of the Near-to-Far-Field Transformation .. 20 2.9.1 Radiation pattern .. 23 2.9.2 Directivity .. 25 Chapter 3 Yagi-Uda Sphere Nano-Antennas Excited by a Dipole Emitter ..43 3.1 Dual-sphere Nano-Antennas.. 44 3.1.1 The comparisons between all-dielectric and metallic structure .. 45 3.1.2 The Metallic Dual-Sphere Nano-Antenna .. 46 3.2 Asymmetry Structure .. 47 3.2.1 Dual-sphers Nano-Antenna with Directors: All-Dielectric(Si) Case .. 48 3.2.2 Dual-sphere with Directors: The Metallic(Ag) case .. 49 3.2.3 The substrate in consideration .. 49 3.3 Electric and Magnetic Resonance in Particles .. 50 Chapter 4 Cylindrical-Rod Yagi-Uda nano-antenna excited by dipole emitter ..69 4.1 Cylindrical-Rod Yagi-Uda Nano-antenna .. 69 4.1.1 Comparison between different length metallic Cylinder Nanoantenna .. 69 4.2 Cylindrical-Rod Yagi-Uda Nano-antenna With Hemisphers Ends .. 71 4.3 On the Substrate .. 72 Chapter 5 Conclusions..87 Bibliography ..90 | |
| dc.language.iso | en | |
| dc.subject | 八木宇田天線 | zh_TW |
| dc.subject | 球狀奈米天線 | zh_TW |
| dc.subject | 遠場性質 | zh_TW |
| dc.subject | 時域有限差分法 | zh_TW |
| dc.subject | FDTD method | en |
| dc.subject | Far-field property | en |
| dc.subject | Yagi-Uda antenna | en |
| dc.subject | Dual-Sphere nanoantenna | en |
| dc.title | 以平行化有限差分時域法分析八木宇田類型奈米天線 | zh_TW |
| dc.title | Analysis of Yagi-Uda Type Nanoantennas Using the Parallelized Finite-Difference Time-Domain Method | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 105-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 楊宗哲,魏培坤,陳瑞琳 | |
| dc.subject.keyword | 時域有限差分法,遠場性質,八木宇田天線,球狀奈米天線, | zh_TW |
| dc.subject.keyword | FDTD method,Far-field property,Yagi-Uda antenna,Dual-Sphere nanoantenna, | en |
| dc.relation.page | 94 | |
| dc.identifier.doi | 10.6342/NTU201703626 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2017-08-18 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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