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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳士元 | zh_TW |
| dc.contributor.advisor | Shih-Yuan Chen | en |
| dc.contributor.author | 吳聖偉 | zh_TW |
| dc.contributor.author | Sheng-Wei Wu | en |
| dc.date.accessioned | 2025-09-17T16:19:12Z | - |
| dc.date.available | 2025-09-18 | - |
| dc.date.copyright | 2025-09-17 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-08-08 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/99668 | - |
| dc.description.abstract | 本論文提出一種應用於無人機防撞雷達之波束可切換之平面圓形天線模組架構，並介紹其兩款不同覆蓋角度範圍之原型設計。首先是一款提供完整360°同平面覆蓋的波束切換平面天線模組，該模組整合了新型的雙模式單刀多擲開關、新型的圓形波束形成網路、一位元相移器，以及類八木天線。
我們所提出之雙模式開關能將輸入功率導向單一輸出端口（單開模式，類似傳統單刀多擲開關），或同時等量導向兩個相鄰的輸出端口（雙開模式），有效地將可用的波束數量加倍。圓形波束形成網路由多個子矩陣以圓形排列而成，相鄰的子矩陣共用其邊緣元件。每個子矩陣作為一個功率分配器，其邊緣元件以三路功率分配器取代。這些邊緣元件能有效地將功率從開關分配至相鄰的子矩陣以及下一級的邊緣元件，實現場型相似、增益相近且平順的波束切換。 為了驗證設計，我們製作並測試一款工作在5.8 GHz具12個可切換波束的天線模組原型。實測結果與模擬結果相吻合，並展現出12個一致的輻射場型，其旁波瓣位準皆低於−13 dB，且兩種開關模式下的增益差異小於1 dB。此外，每個波束都具有30°的半功率波束寬，確保水平方向上的全覆蓋，且相鄰波束間重疊極小。 其次是一款工作於24 GHz具備7個可切換波束以達到前向180°水平覆蓋之天線模組，並與市售之調頻連續波雷達模組整合。我們的天線模組包含一顆雙模式開關晶片、半平面覆蓋之平面圓形波束形成器、9個反射式相移器，以及9個改良的類八木天線。整個防撞雷達系統整合了前述之前向半平面覆蓋之波束切換天線模組、24-GHz雷達收發模組、微控制器，以及具中頻訊號放大器的電源控制電路。 實驗結果顯示，該天線模組原型得以在水平面上透過7個波束實現前向180°半平面的場型覆蓋能力，且每個波束場型高度相似，皆具有小於0.2 dB的增益差異、27°的半功率波束寬、以及−9 dB的旁波瓣位準。此外，透過天線模組中的反射式相移器可實現連續的相位調整，可進一步實現切換波束之間小範圍的波束掃描，以達到更準確的障礙物定位。 | zh_TW |
| dc.description.abstract | In this dissertation, we proposed a configuration for a planar and circular antenna module for collision avoidance radars to be deployed on drones or unmanned aerial vehicles (UAVs) and presented two different prototype module designs. First, a beam-switching antenna module offering complete 360° horizontal coverage is introduced. This module integrates a novel dual-mode single-pole-multiple-throw (SPMT) switch, a novel circular beamforming network (CBFN), one-bit phase shifters, and quasi-Yagi antennas.
The dual-mode switch is capable of routing input power either to a single output port as a traditional SPMT switch (single-ON mode) or equally to two adjacent output ports (dual-ON mode), effectively doubling the number of available beam directions. The CBFN is formed by arranging modified sub-matrices (MSMs) in a circular layout, where adjacent MSMs share edge components (ECs). Each MSM functions as a binomial power divider, with the ECs replaced by three-way power dividers. These ECs enable efficient power distribution from the switch to adjacent MSMs and to downstream ECs, facilitating seamless beam transitions. For verification, a 12-beam beam-switching prototype module operating at 5.8 GHz was fabricated and tested. The measured results closely align with simulations, demonstrating 12 consistent beam patterns with sidelobe levels (SLLs) below −13 dB and gain variations under 1 dB between the two switch modes. Each beam exhibits a 30° half-power beamwidth (HPBW), ensuring full in-plane coverage with minimal overlap between adjacent beams. Second, a 24-GHz 7-beam beam-switching prototype module with forward-looking 180° in-plane coverage is presented. Its integration with a commercially available 24-GHz radar module is also presented. The antenna module is composed of a dual-mode switch chip with circulator function, a circular beamformer for half-plane coverage, reflection-type phase shifters (RTPSs), and metamaterial (MTM)-loaded quasi-Yagi antennas. Besides, a power supply module and a control circuitry, including an IF signal amplifier, were also designed and integrated with a microcontroller to realize the beam-switching function. The experimental results show that the antenna module is capable of achieving forward-looking 180° in-plane coverage with seven beams exhibiting similar beam patterns, less than 0.2 dB gain variation, 27° HPBW, and −9 dB SLL. On top of that, with the aid of the RTPSs, this prototype module can achieve continuous beam scanning between adjacent beam patterns, rendering it possible to achieve a more accurate localization of obstacles. | en |
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| dc.description.provenance | Made available in DSpace on 2025-09-17T16:19:12Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 ii
誌謝 iii 中文摘要 v ABSTRACT vi CONTENTS viii LIST OF FIGURES xi LIST OF TABLES xix Chapter 1 Introduction 1 1.1 Motivation 1 1.2 Contribution 4 1.3 Chapter Outline 6 Chapter 2 Beam-Switching Planar and Circular Antenna Module with 360° In-Plane Coverage 7 2.1 Literature Review of 360° Coverage Designs 7 2.2 Background Theory 11 2.2.1 Beamforming of Circular Array with Cophasal Excitation 11 2.2.2 Phase Mode Theory with Directional Antenna Elements 12 2.3 System Block Diagram 15 2.4 Reconfigurable Beamformer 16 2.4.1 Dual-Mode SPMT Switch 16 2.4.2 Circular Beamforming Network 21 2.5 Radiation Pattern Analysis of Circular Array Fed by Reconfigurable Beamformer 30 2.5.1 Choice of MSM Stage Number, q 32 2.5.2 Choice of Element Feeding Radius, r 33 2.5.3 (Option) Choice of Beam Number, X 34 2.5.4 Discussion and Conclusion of the Pattern Analysis 36 Chapter 3 Prototype Verification of 5.8-GHz Beam-Switching Planar and Circular Antenna Module with Full 360° In-Plane Coverage 37 3.1 Dual-Mode SP6T Switch 38 3.2 Circular Beamforming Network 41 3.2.1 CBFN Constructed by One-Stage MSMs 41 3.2.2 CBFN Constructed by Two-Stage MSMs 45 3.2.3 Summary of the Proposed CBFNs 50 3.3 One-Bit Phase Shifter 53 3.4 Antenna Element 58 3.5 Fully Integrated, Beam-Switching Planar Antenna Module for 360° In-Plane Coverage 60 3.6 Comparison and Conclusion 68 3.6.1 Comparison with State-of-the-Art Designs 68 3.6.2 Summary 70 Chapter 4 24-GHz Forward-Looking Beam-Switching Planar Antenna Module with Half-Plane Coverage 71 4.1 System Block Diagram 71 4.2 Link Budget Consideration 72 4.3 Building Components of the Proposed Forward-Looking Beam-Switching Planar Antenna Module with Half-Plane Coverage 76 4.3.1 Quasi-Circulator and Dual-Mode SP4T Switch IC 78 4.3.2 Modified M6N1 CBFN 84 4.3.2.1 Three-Way Power Divider 84 4.3.2.2 Two-Way Power Combiner 89 4.3.2.3 Integration of the Modified M6N1 CBFN 91 4.3.3 Phase Shifting Section 95 4.3.3.1 Reflection-Type Phase Shifter 96 4.3.3.2 Phase Inverter 98 4.3.4 Antenna Element and Circular Array 104 4.4 Module Integration and Verification 108 4.4.1 Power Supply and Beam-Switching Control Circuit 108 4.4.2 Verification of the Proposed Forward-Looking Beam-Switching Antenna Module 112 Chapter 5 Conclusion and Future Work 120 5.1 Conclusion 120 5.2 Future Work 121 Appendix A Measured Results of the RTPS 124 Appendix B Power Supply and Beam-Switching Control Circuit 126 Appendix C Physical Dimensions of the Antenna Module Fixture 130 Appendix D Measured Noise Figures of the 24-GHz Antenna Module 134 References 138 | - |
| dc.language.iso | en | - |
| dc.subject | 圓形波束形成器 | zh_TW |
| dc.subject | 防撞雷達 | zh_TW |
| dc.subject | 單刀多擲切換開關 | zh_TW |
| dc.subject | 波束切換天線模組 | zh_TW |
| dc.subject | beam-switching antenna modules | en |
| dc.subject | collision avoidance radars | en |
| dc.subject | single-pole-multiple-throw switches | en |
| dc.subject | circular beamformers | en |
| dc.title | 應用於無人機防撞雷達之具360°同平面覆蓋及前向180°半平面覆蓋之波束切換平面天線模組 | zh_TW |
| dc.title | Beam-Switching Planar Antenna Modules with 360° In-Plane Coverage and Forward-Looking 180° Half-Plane Coverage for Drone Collision Avoidance Radar | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 博士 | - |
| dc.contributor.coadvisor | 林坤佑 | zh_TW |
| dc.contributor.coadvisor | Kun-You Lin | en |
| dc.contributor.oralexamcommittee | 曾昭雄;馬自莊;廖文照;陳念偉;陳晏笙 | zh_TW |
| dc.contributor.oralexamcommittee | Chao-Hsiung Tseng;Tzyh-Ghuang Ma;Wen-Jiao Liao;Nan-Wei Chen;Yen-Sheng Chen | en |
| dc.subject.keyword | 波束切換天線模組,圓形波束形成器,單刀多擲切換開關,防撞雷達, | zh_TW |
| dc.subject.keyword | beam-switching antenna modules,circular beamformers,single-pole-multiple-throw switches,collision avoidance radars, | en |
| dc.relation.page | 147 | - |
| dc.identifier.doi | 10.6342/NTU202503073 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2025-08-12 | - |
| dc.contributor.author-college | 電機資訊學院 | - |
| dc.contributor.author-dept | 電信工程學研究所 | - |
| dc.date.embargo-lift | 2030-07-30 | - |
| 顯示於系所單位： | 電信工程學研究所 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-113-2.pdf 此日期後於網路公開 2030-07-30 | 21.95 MB | Adobe PDF |
系統中的文件，除了特別指名其著作權條款之外，均受到著作權保護，並且保留所有的權利。