臺灣博碩士論文加值系統

本論文探討先前由學長設計的『金屬貼附標籤天線』的小型化設計，先前設計之『金屬貼附標籤天線』之大小是2cm*4cm*3mm，在背面有金屬板存在時有6dBi的天線增益且放置於自由空間有4dBi的天線增益。在上述兩種情況中皆可穩定的讀取到6米的距離，但是用於各種應用天線的大小似乎是一問題，本論文特別討論為了應用於航空站鉆板軌道上的應用，希望將天線的寬度縮減以利使用。本論文使用HFSS對於天線架構進行模擬且使用AWID RFID Reader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中進行讀取效能的測量。本文對與所提出之架構進行一步步的分析希望對於參考者在設計相關類型天線時提供一點直覺上的幫助。

In the thesis, we studied about the miniaturization of the Metal Mounting Tag which is designed by one of my senior previously. The size of the previous design is 20mm*40mm*3mm, and it has 6dBi antenna gain back of a metallic plate and 4dBi antenna gain in free-space respectively. In the both two situations that we just described, the typical readable ranges 6 meters are read stably , but there is a problem for applying the antenna design in various application ---- Size！In the thesis, we focus on a special application to mount the tag on an airport trailer rail with a limited width. Thus we desire to reduce the width of the tag antenna. For designing and studying, the Full-Wave simulation software is employed for simulate the proposed antenna configuration, and the anechoic chambers of NTUST Communication and Electromagnetic Technology Center is also utilized for verify the performance on the new design. In the thesis, we also discuss the details of the proposed antenna configuration “step by step”, I wish the viewpoints that we interested in could offer more instincts for the consulter to design a similar one.

摘要 2
ABSTRACT 3
誌謝 4
CONTENTS 5
TABLE OF FIGURES 7
LIST OF TABLES 10
INTRODUCTION 11
1.1 BACKGROUND 11
1.2 OBJECTIVE 13
1.3 CHAPTER OUTLINE 14
ANTENNA THEORY FOR RFID TAG 15
2.1 INTRODUCTION 15
2.2 THE ANTENNA CHARACTERISTICS 15
2.2.1 RADIATION PATTERN 16
2.2.2 DIRECTIVITY AND GAIN 18
2.2.3 POLARIZATION 20
2.3.4 IMPEDANCE 22
2.3.5 RETURN LOSS AND BANDWIDTH 25
2.4 FRIIS TRANSMISSION FORMULA 27
INTRODUCTION TO RFID SYSTEM 29
3.1 THE BASIC OF RFID SYSTEM 29
3.2 CLASSIFICATION OF RFID SYSTEM 30
3.3 FACTORS AFFECTING SYSTEM PERFORMANCE 32
3.3.1 RF SIGNAL PROPAGATION 32
3.4 THE DESIGN PROCESS OF RFID TAG ANTENNA 39
3.4.1 FREQUENCY BAND 40
3.4.2 TAG CHIP MODEL AND MEASUREMENT 42
3.4.3 TAG REQUIREMENTS 44
RFID TAG ANTENNA DESIGN 45
4.1 INTRODUCTION 45
4.2 PREVIOUS METAL MOUNTING TAG ANTENNA DESIGN 45
4.2.1 GEOMETRY OF THE PREVIOUS PROPOSED ANTENNA 46
4.2.2 PROPERTY AND PARAMETERS STUDY 47
4.2.3 SUMMERY OF THE PREVIOUS DESIGN 54
4.3 MINIATURIZATION OF THE METAL MOUNTING TAG 58
4.3.1 PROPOSED ANTENNA GEOMETRY 58
4.3.2 PARAMETERS STUDY 59
4.3 IMPLEMENTATION AND MEASUREMENT 75
CONCLUSION 77
5.1 SUMMARY 77
5.2 CONCRETE ACHIEVEMENT 77
5.3 FUTURE WORKS 77
REFERENCES 78

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