臺灣博碩士論文加值系統

本論文探討可應用於金屬物體表面之超高頻射頻辨識標籤天線設計，其中乃應用電磁數值模擬軟體HFSS分析與設計標籤天線，其型式包括：槽孔天線、曲折線路天線以及偶極天線，並且實作之，再於本校無線通訊與電磁相容技術研發中心之無反射實驗室測量所製作標籤天線之特性以及可讀取距離，來驗證所設計標籤天線的效能。此外，亦進行天線之參數分析，以研究天線的阻抗特性與天線架構之關係，來建立可貼附於金屬物體表面之超高頻射頻辨識標籤天線的設計技術。

In this thesis, UHF radio frequency identification (RFID) tag antennas that can be used on metallic objects are studied. An electromagnetic numerical simulation software package, HFSS, is applied in this study to analyze and design the RFID tag antennas. The types of the tag antennas include the slot antenna, meandered-line antenna, and dipole antenna. The prototypes of the RFID tag designs are fabricated and then measured in the anechoic chambers of NTUST Communication and Electromagnetic Technology Center to verify the performance of those tag antennas. Also, a parameter study is performed to investigate the impedance characteristics of the antennas with respect to antenna geometries. Thus, the technique for designing the UHF RFID tag antennas to be attached on metallic objects is developed.

摘要 I
Abstract II
致謝 III
Content IV
List of Figures VII
List of Tables X
Chapter 1 Introduction 1
1.1 Background 1
1.2 Objective 2
1.3 Chapter Outline 3
Chapter 2 Antenna theory 4
2.1 Introduction 4
2.2 The Basic Principle of Radiation 4
2.3 Antenna Parameters 6
2.3.1 Input impedance 7
2.3.2 Return Loss 11
2.3.3 Voltage Standing Wave Ratio (VSWR) 13
2.3.4 Radiation Pattern 14
2.3.5 Directivity 16
2.3.6 Gain and Friis transmission formula 18
Chapter 3 Introduction to RFID System 21
3.1 The Basic of RFID System 21
3.2 Classification of RFID System 22
3.3 Factors Affecting System Performance 25
3.3.1 RF Signal Propagation 25
3.3.2 Material 31
3.4 The Design Process of RFID Tag Antenna 33
3.4.1 Frequency band 34
3.4.2 Tag requirements 37
3.4.3 Tag chip model 38
3.4.4 Antenna parameter 40
3.4.5 Antenna design and fine tuning 40
3.4.6 Implementation and Measurement 41
Chapter 4 Metal Tag Antenna Design 44
4.1 Introduction 44
4.2 Slot Metal Tag 44
4.3 Meandered Dipole Metal Tag 57
4.3 Dipole Metal Tag 62
4.3.1 Geometry 62
4.3.2 Parameter Study 65
4.3.3 Implement of the dipole metal tag antenna 73
Chapter 5 Conclusion 81
5.1 Summary 81
5.2 Concrete Achievement 82
5.3 Future Work 83
References 84

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