跳到主要內容

臺灣博碩士論文加值系統

(100.28.2.72) 您好!臺灣時間:2024/06/16 07:43
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:羅啟業
研究生(外文):Chi-Ya-Lo
論文名稱:阻抗負載對射頻辨識偵測之效應
論文名稱(外文):Effects of Impedance Loading on RFID Detection
指導教授:李學智李學智引用關係
指導教授(外文):Hsueh-Jyh Li
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:英文
論文頁數:93
中文關鍵詞:天線形式部份後向散射場阻抗負載殘餘形式部份
外文關鍵詞:Antenna mode componentBackscattered fieldImpedance loadingResidual mode component
相關次數:
  • 被引用被引用:0
  • 點閱點閱:271
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:2
隨著自動化程序應用的增加,射頻辨識系統 (RFID system) 的研究更形重要。這本論文主要的目的即是探討阻抗負載 (impedance loading) 對於射頻辨識系統及其辨識能力 (detection ability) 的影響。我們使用一個式子來解釋阻抗負載對於後向散射場 (backscattered field) 的影響,此後向散射場是由殘餘形式部份 (residual mode component) 和天線形式部份 (antenna mode component) 所組成。我們也討論了如何用力矩法 (method of moments) 去計算後向散射場。除此之外,我們發現散射天線的一些性質也和阻抗負載的效應有關,如天線極化方向 (polarization), 天線增益 (gain), 以及天線的輻射場型 (radiation pattern)。在一個無線辨識系統裡,我們使用了兩個阻抗值來當作後向散射調變 (backscatter modulation) 的兩個狀態。射頻辨識偵測的主要目的就是要來分辨負載的狀態。因此,調變準位差越大,偵測效率越好。我們發現了兩個阻抗能讓後向散射場的準位差最大。除此之外,我們發現在射頻偵測時,同調的方法 (coherent method) 比非同調的方法 (incoherent method) 來的好。然而,假如一個射頻辨識系統的通道是處在一個多路徑波 (multipath) 的環境中,所收到的訊號將會遭受嚴重的衰退。
With the increasing applications of automatic procedures, the researches on the RFID system will become more indispensable. In this thesis, the main purpose is to discuss the effects of impedance loading on a RFID system and its detection ability. We use an equation to explain the effects of impedance loading on the backscattered field, which is contributed by the residual mode component and the antenna mode component. We also discuss how to use the method of moments to calculate the backscattered field. In addition, we found that the tag scattering antenna’s properties are related to the effects of impedance loading, such as polarization, antenna gain, and antenna’s radiation pattern. In a RFID system, we use two loading values as the two states of backscatter modulation. The main purpose of RFID detection is to differentiate between the loading states. As a result, the larger the modulation level difference is, the better the detection performance is. We have found that two loadings with opposite reflection coefficients can give the maximum variation of the backscattered field. We also found that the coherent detection method can perform better than the incoherent detection method on RFID detection. If the channel of a RFID system is in a multipath environment, the signals received will suffer severe fading.
Abstract I
Contents III
List of Figures V
List of Tables IX
Chapter 1 Introduction 1
1.1 Overview of Identification Systems 1
1.2 Motivation 2
1.3 Organization of Thesis 3
Chapter 2 Effect of Impedance Loading on Backscattering 5
2.1 Overview of a RFID System 5
2.2 Impedance Loading 6
2.2.1 Concept of Impedance Loading 6
2.2.2 Theoretical Analysis 7
2.3 Another Viewpoint of Impedance Loading by Using Moment
Methods 10
Chapter 3 Measurement of Backscattered Field 15
3.1 System Setup 15
3.2 Measurement 19
3.2.1 Measurement Settings 27
3.2.2 Measurement Results 31
3.3 Detection 45
3.3.1 Measurement Settings 48
3.3.2 Measurement Results 50
3.3.3 Measurement Results by using an EPCglobal Generation-1 IC 56
3.4 Effect of Multi-Path 57
Chapter 4 RFID Detection by Using an IC 63
4.1 Link Timing of EPC Class-1 63
4.1.1 Generation-1 63
4.1.2 Generation-2 64
4.2 Theory of Our Measurement 69
4.3 System Setup 72
4.4 Measurement 74
4.4.1 Design and Setting of Measurement for Gen-1 IC 74
4.4.1.1 Part I (original) 76
4.4.1.2 Part II (shunt 1pF) 77
4.4.2 Result for Gen-1 IC 79
4.4.2.1 Part I (original) 80
4.4.2.2 Part II (shunt 1pF) 80
4.4.3 Design and Setting of Measurement for Gen-2 IC 81
4.4.3.1 Part I (original) 82
4.4.3.2 Part II (cascade 18 ) 83
4.4.4 Result for Gen-2 IC 84
4.4.4.1 Part I (original) 85
4.4.4.2 Part II (cascade 18 ohm) 86
Chapter 5 Conclusion 87
Reference 91
[1] Klaus Finkenzeller, RFID Handbook: Fundamentals and Application in Contactless Smart Cards and Identification, John Wiley & Sons, second edition, 2006
[2] http://www.trtc.com.tw/c/
[3] http://www.epic.org/privacy/rfid
[4] K. V.S. Rao, An Overview of Back Scattered Radio Frequency Identification System(RFID), Intermec Technologies Corporation, 3Skyline Drive, Hawthorne, NY -10532, USA
[5] Udo Karthaus, Fully Integrated Passive UHF RFID Transponder IC With 16.7-uW Minimum RF Input Power, IEEE, and Martin Fischer
[6] Technical report, 860MHz–930MHz Class I Radio Frequency Identification Tag Radio Frequency & Logical Communication Interface Specification Candidate Recommendation, Version 1.0.1, Auto-ID Center
[7] Specification for RFID Air Interface, EPC™ Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID Protocol for Communications at 860 MHz – 960 MHz Version 1.0.9, EPCglobal
[8] Mr. R M Hornby, TIRIS Programme Manager, RFID Solutions for the Express Parcel and Airline Baggage Industry, Texas Instruments Limited
[9] Yifeng Han, Hao Min, System Modeling and Simulation of RFID, Auto-ID Labs at Fudan University, Shanghai, P. R. China, 200433
[10] Green, R. B., The General Theory of Antenna Scattering, Antenna laboratory, Ohio State University, Report No. 223-17 (November 1963)
[11] George T. Ruck, Donald E. Barrick, William D. Stuart, Clarence K. Krichbaum, Radar Cross Section Handbook Volume 2, Battelle Memorial Institute, Columbus Laboratories, Columbus, Ohio, Plenum Press, New York, London, 1970
[12] Warren L. Stutzman, Gary A. Thiele, Antenna Theory and Design, 1981, John Wiley & Sons
[13] Meng-Lin Chung, Simulation and Implementation of a Switched Beam Antenna System for WLAN, thesis of GICE of NTU, June 2004
[14] K. Penttila, M. Keskilammi, L. Sydanheimo and M. Kivikoski, Radar Cross-Section Analysis for Passive RFID Systems
[15] Theodore S. Rappaport, Wireless Communication, Principles and Practice, Second Edition, Pearson Education International
[16] Pavel V. Nikitin, Member, IEEE, K. V. Seshagiri Rao, Senior Member, IEEE, Sander F. Lam, Vijay Pillai, Member, IEEE, Rene Martinez, and Harley Heinrich, Power Reflection Coefficient Analysis for Complex Impedances in RFID Tag Design
[17] K. Kurokawa, “Power waves and the scattering matrix,” IEEE Trans. Microw. Theory Tech., vol. MTT-13, no. 3, pp. 194–202, Mar. 1965
[18] 射頻辨識技術之研究期中報告,計畫主持人: 楊成發 教授,協同主持人: 李學智 教授 林舜天 教授 劉馨勤 教授 馬自莊 教授,執行單位: 國立台灣科技大學 電機工程學系,2006年3月
[19] EPCglobalTM Generation 2 RFID, MONZA, Impinj
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top