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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳士元 | zh_TW |
dc.contributor.advisor | Shih-Yuan Chen | en |
dc.contributor.author | 蔡昀廷 | zh_TW |
dc.contributor.author | Yun-Ting Tsai | en |
dc.date.accessioned | 2023-10-03T16:52:20Z | - |
dc.date.available | 2023-11-09 | - |
dc.date.copyright | 2023-10-03 | - |
dc.date.issued | 2023 | - |
dc.date.submitted | 2023-07-25 | - |
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Mautz, “Theory of characteristic modes for conducting bodies,” IEEE Trans. Antennas Propag., vol. 19, no. 5, pp. 622–628, Sep. 1971. [18] R. Harrington, J. Mautz, and Y. Chang, “Characteristic modes for dielectric and magnetic bodies,” IEEE Trans. Antennas Propag., vol. 20, no. 2, pp. 194–198, Mar. 1972. [19] E. Newman, “Small antenna location synthesis using characteristic modes,” IEEE Trans. Antennas Propag., vol. 27, no. 4, pp. 530–531, Jul. 1979. [20] Y. Chen and C.-F. Wang, “Characteristic-Mode-Based Improvement of Circularly Polarized U-Slot and E-Shaped Patch Antennas,” IEEE Antennas Wirel. Propag. Lett., vol. 11, pp. 1474–1477, 2012. [21] J. Zeng, X. Liang, L. He, F. Guan, F. H. Lin, and J. Zi, “Single-Fed Triple-Mode Wideband Circularly Polarized Microstrip Antennas Using Characteristic Mode Analysis,” IEEE Trans. Antennas Propag., vol. 70, no. 2, pp. 846–855, Feb. 2022. [22] P.-Y. Qin, A. R. Weily, Y. J. Guo, and C.-H. Liang, “Polarization Reconfigurable U-Slot Patch Antenna,” IEEE Trans. Antennas Propag., vol. 58, no. 10, pp. 3383–3388, Oct. 2010. [23] Roger F. Harrington, “Plane Wave Functions,” Time-Harmonic Electromagnetic Fields, 2nd ed., New York, NY, USA: Wiley, 2001, ch 4, sec. 4-8. [24] C. Wang, E. Li, and D. F. Sievenpiper, “Surface-Wave Coupling and Antenna Properties in Two Dimensions,” IEEE Trans. Antennas Propag., vol. 65, no. 10, pp. 5052–5060, Oct. 2017. [25] T Teshirogi, M Tanaka, W Chujo, “Wideband Circularly Polarized Array Antenna with Sequential Rotations and Phase Shift of Elements,” IEICE Proc. Ser., vol. 5, no. 1B3-2, Aug. 1985. [26] J. Huang, “A technique for an array to generate circular polarization with linearly polarized elements,” IEEE Trans. Antennas Propag., vol. 34, no. 9, pp. 1113–1124, Sep. 1986. [27] H. Evans, P. Gale, B. Aljibouri, E. G. Lim, E. Korolkeiwicz, and A. Sambell, “Application of simulated annealing to design of serial feed sequentially rotated 2 × 2 antenna array,” Electron. Lett., vol. 36, no. 24, p. 1987, 2000. [28] A. Chen, Y. Zhang, Z. Chen, and C. Yang, “Development of a Ka-Band Wideband Circularly Polarized 64-Element Microstrip Antenna Array With Double Application of the Sequential Rotation Feeding Technique,” IEEE Antennas Wirel. Propag. Lett., vol. 10, pp. 1270–1273, 2011. | - |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90615 | - |
dc.description.abstract | 本論文首先提出基於三個模態之寬頻圓極化天線單元、據此設計寬頻圓極化可切換之天線單元、並提出一個可減緩陣列內部耦合所造成效能下降的子陣列設計流程,以及為不同應用場景所設計,基於通解型序列式旋轉饋入的天線陣列。
首先,本論文提出的寬頻圓極化天線單元為具有U形開槽與四個截角的矩形貼片天線,由於其軸比值頻率響應具有兩個低點,此天線的軸比頻寬從傳統U形開槽貼片天線的5%增加至14.6%。吾人利用特徵模態分析發現此設計因激發出第三個主模態,形成一個有別於傳統的三模態工作模式,貢獻了此軸比頻寬。 此外,吾人在此設計上加入兩顆切換用的PIN二極體,以實現極化可切換之特性並維持原天線尺寸。這兩顆PIN二極體使U形開槽具有可重構性。透過適當的設計,隔離射頻和直流訊號用的元件與開槽對於模態分佈之干擾皆被抑制。所設計的天線可以在不增加尺寸和複雜度的情況下在左手和右手圓極化之間切換,並具有12.6%的可用頻寬。 由於原本天線的寬頻圓極化特性在擴展成大陣列後會因為陣列內部耦合而有大幅度的失真,本論文提供一個建立於耦合分析的子陣列設計流程,減緩耦合在大型陣列中與掃描波束時的影響。最後,在大型陣列的設計,除了傳統直接複製多個子陣列的方式,本文另外提出三種基於通解型序列式旋轉饋入的天線陣列設計,為不同場景提供更高的寬邊輻射增益、波束掃描範圍內更穩定的軸比頻寬,或在寬邊增益和波束掃描到其他角度的增益損失之間進行權衡。 | zh_TW |
dc.description.abstract | In this thesis, we proposed a tri-mode broadband circularly-polarized (CP) antenna element, broadband circular polarization-switchable antennas based on the proposed design, a sub-array design flow mitigating degradations due to mutual coupling, and novel extensive antenna arrays based on generalized sequential rotation feeding technique for various application scenarios.
Firstly, thanks to the two dips in the AR response, the proposed antenna element, a U-slot patch antenna with four truncated corners, shows a 14.6% axial-ratio (AR) bandwidth, significantly improved from the 5% AR bandwidth of a traditional U-slot patch antenna. It is shown by characteristic mode analysis that the proper excitation of the third dominant mode results in a unique tri-mode CP operation, leading to a wide bandwidth. Moreover, inserting two PIN diodes transforms the antenna into a polarization-agile one. The two PIN diodes enable the U-slot to be reconfigurable. The effect on the modal current distributions can be mitigated by properly designing the associated bias circuit, including the slits and the SMD components. The designed antenna can switch between left-handed and right-handed CP with a 12.6% usable bandwidth without increasing the size and complexity. In addition, we also provide a sub-array design flow that mitigates the distortions due to coupling regarding an array with considerable elements and beam scanning. Finally, besides direct subarray duplication for an extensive array, three alternative designs based on the generalized sequential rotation feeding technique are proposed in this thesis, providing a higher broadside gain, a more stable AR bandwidth during beam scanning, or trading off between broadside gain and scanning gain loss for different scenarios. | en |
dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-10-03T16:52:20Z No. of bitstreams: 0 | en |
dc.description.provenance | Made available in DSpace on 2023-10-03T16:52:20Z (GMT). No. of bitstreams: 0 | en |
dc.description.tableofcontents | 口試委員審定書 ……………………………………………………………………..#
誌謝 i 中文摘要 ii ABSTRACT iii CONTENTS v LIST OF FIGURES viii LIST OF TABLES xv Chapter 1 Introduction 1 1.1 Background 1 1.2 Motivation 2 1.3 Content Overview 4 Chapter 2 A Circularly-Polarized Antenna with Wide Axial-Ratio Bandwidth 5 2.1 Proposed Design 5 2.1.1 Antenna Geometry 5 2.1.2 Simulation Results 7 2.2 Theory of Characteristic Modes 11 2.2.1 Characteristic Modes for Conducting Bodies 11 2.2.2 Characteristic Modes for Dielectric Bodies 13 2.2.3 Characteristic Modes for Circularly-Polarized Antennas 14 2.3 Characteristic Mode Analysis of the Proposed Antenna 15 2.4 Comparisons of the Proposed Antenna with Previous Works 24 2.4.1 Comparisons of the Proposed Antenna with the Traditional U-Slot Patch Antenna 24 2.4.2 Comparisons of the Proposed Antenna with the U-Slot Patch Antenna with Probe Offset 27 2.5 Measurement Results 29 Chapter 3 Circularly-Polarized Antennas with Polarization Agility 33 3.1 A Polarization-Reconfigurable Antenna: Version I 33 3.1.1 Concept and Geometry 33 3.1.2 Simulation Results 35 3.2 A Polarization-Reconfigurable Antenna: Version II 38 3.2.1 Geometry and Simulated Results 38 3.3 Measurement Results 41 Chapter 4 Circularly-Polarized Antenna Arrays with Wide Axial-Ratio Bandwidth 49 4.1 Mutual Coupling Analysis 49 4.1.1 Coupling Sources 49 4.1.2 Separation of Surface-Guided Wave and Free-Space Wave 50 4.1.3 Coupling Analysis of the Designed Antenna Array Based on Traditional Arrangement 52 4.2 Sub-Array Design 55 4.2.1 Sequential Rotation 55 4.2.2 Coupling-Analysis-Based Subarray Design 57 4.2.3 Design Flow for a Subarray 67 4.3 Realization of the Subarray with Fixed Beam 69 4.3.1 Power Divider Design 69 4.3.2 The Designed Subarray with Fixed Beam 71 4.3.3 Measurement Setup and Results 76 4.4 Extensive Array Designs 78 4.4.1 Generalized Sequential Rotation 79 4.4.2 Four Extensive Array Designs 80 Chapter 5 Conclusion 93 Bibliography 95 | - |
dc.language.iso | en | - |
dc.title | 應用於低軌衛星通訊之寬頻左右圓極化可切換之天線單元及子陣列設計 | zh_TW |
dc.title | Design of Broadband Right- and Left-Handed Circular Polarization-Switchable Antenna Element and Sub-Array for Low Earth Orbit Satellite Communication | en |
dc.type | Thesis | - |
dc.date.schoolyear | 111-2 | - |
dc.description.degree | 碩士 | - |
dc.contributor.oralexamcommittee | 馬自莊;廖文照;陳念偉;歐陽良昱 | zh_TW |
dc.contributor.oralexamcommittee | Tzyh-Ghuang Ma;Wen-Jiao Liao;Nan-Wei Chen;Liang-Yu Ou Yang | en |
dc.subject.keyword | 軸比頻寬,耦合,極化可切換,序列式旋轉饋入,U形開槽貼片天線, | zh_TW |
dc.subject.keyword | axial-ratio bandwidth,mutual couplings,polarization agility,sequential rotation,U-slot patch antennas, | en |
dc.relation.page | 97 | - |
dc.identifier.doi | 10.6342/NTU202301854 | - |
dc.rights.note | 同意授權(全球公開) | - |
dc.date.accepted | 2023-07-26 | - |
dc.contributor.author-college | 電機資訊學院 | - |
dc.contributor.author-dept | 電信工程學研究所 | - |
顯示於系所單位: | 電信工程學研究所 |
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