研究生: |
李明憲 Ming-Hsien Li |
---|---|
論文名稱: |
多載波超高頻無線射頻辨識系統之被動式標籤設計 UHF Passive Tag Design for Multi-Carrier RFID Systems |
指導教授: |
姚嘉瑜
Chia-Yu Yao 劉馨勤 Hsin-Chin Liu |
口試委員: |
呂學坤
Shyue-Kung Lu 楊成發 Chang-Fa Yang |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電機工程系 Department of Electrical Engineering |
論文出版年: | 2012 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 57 |
中文關鍵詞: | 多載波 、標籤 、無線射頻辨識系統 、濾波器 、解調 |
外文關鍵詞: | Filter, Multi-carrier, Tag, RFID, Demodulation |
相關次數: | 點閱:311 下載:0 |
分享至: |
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
被動式無線射頻辨識系統是目前全世界使用最普遍的辨識系統,在此系統中,被動式射頻標籤藉由讀取器發射出的電磁波獲得能量,並回傳相對應的反向散射訊號至讀取器。然而在傳播路徑衰減的環境下,限制了標籤的讀取距離。多載波射頻辨識系統使用了獨立的連續波發射器來改善此問題,但是在該系統中連續波發射器雖然提供了額外的能量給標籤,卻可能降低標籤接收到的指令訊號之調變深度,而導致標籤解調讀取器訊號錯誤。本論文提出新的被動式射頻標籤解調電路架構,使其能夠在多載波射頻辨識系統裡達到較長的讀取距離。
本論文提出兩種被動式射頻標籤架構,第一種使用被動式電容電感元件組成一窄頻阻抗匹配電路設置於波峰檢測器前端,以避免標籤接收到的連續波訊號通過解調器電路。第二種則使用一帶通SAW濾波器,其設計比照市面上之產品特性,設置於波峰檢測器前端,以濾除標籤接收到的連續波訊號。模擬結果顯示此兩種標籤設計皆能解決調變深度限制的問題,並且與讀取限制之理論分析符合。
此研究使用安捷倫的ADS(Advanced Design System)軟體模擬多載波無線射頻辨識系統,以用來進行本論文提出之被動式射頻標籤設計驗證,並分析其效能及可行性。
Passive RFID system is the most popular system be used all over the world. In this system, a passive RFID tag gains its power from reader emitting electromagnetic wave, and backscatter its responding signal to the reader. However, Because of the large propagation loss, the accessible range of a passive RFID tag is hence limited. In order to mitigate the problems, a multi-carrier UHF passive RFID system utilizes isolated continuous wave emitters to provide additional power to passive RFID tags. This approach however reduces the modulation depth of reader command signals and results in reader signal demodulation error in a passive RFID tag. This work proposes a new passive RFID tag demodulation circuit which can extend the tag read range in a multi-carrier system.
Two types of passive RFID tag architecture are proposed. One uses a narrow band impedance matching circuit before the envelope detector to prevent the signal from the continuous wave emitter passing through the demodulator. The other uses a band-pass SAW filter simulator, which is designed according to the specification of a real product, before the envelope detector to suppress the signal from the continuous wave emitter. Simulation results show that both tag designs can overcome the modulation depth constraint, and are in accordance with theoretical analysis.
This study uses Agilent Advanced Design System software to simulate a multi-carrier passive RFID system, which is used to verify the proposed passive RFID tag design and to analyze its performance and feasibility.
參考文獻
[1] "EPCTM Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID Protocol for Communications at 860MHz-960MHz Version 1.20," http://www.epcglobalinc.org, 2008.
[2] "ISO/IEC Radio-frequency Identification for item management-part 6C: parameters for air interface communications at 860MHz to 960MHz," http://www.iso.org, 2012.
[3] "Ubiquitous ID Architecture," http://www.uidcenter.org, 2008.
[4] "MonzaR 5 Tag Chip Datasheet," Impinj, Monza, FastID, and TagFocus, 2012.
[5] D. Kim, M. A. Ingram, and W. W. Smith, "Measurements of small-scale fading and path loss for long range RF tags," Antennas and Propagation ,IEEE Transactions, vol. 51, no.8, pp. 1740-1749, Aug. 2003.
[6] D. M. Dobkin, The RF in RFID: Passive UHF RFID in Practice, Newnes, 2007.
[7] "Speedway Revolution Readers R420, R220 datasheet," Impinj, 2011.
[8] J.-F. Huang, X. Yang, J.-P. Shen, X.-X. Feng, X.-A. Wang, and R. Huang, "An ultra-low power passive UHF RFID transponder with self-calibrated clock generator," in RFID, 2010 IEEE International Conference on, 2010, pp. 77-82.
[9] H.-C. Liu, Y.-T. Chen, and W.-S. Tzeng, "A Multi-Carrier UHF Passive RFID System," in proc. 2007 International Symposium on Applications and the Internet Workshops – Workshop on Networked RFID, Hiroshima, Jan. 15-19, 2007.
[10] K. Finkenzwller, RFID Handbook, Second edition, John Wiley and Sons, 2003.
[11] Y.-F. Chen, H.-C. Liu, and Y.-T Chen, "A Frequency Diverse Gen2 RFID System with Isolated Continuous Wave Emitters," Journal of Networks, vol. 2, no. 5., Sep. 2007.
[12] 郭哲榮, 「多載波超高頻被動式射頻辨識系統分析」, 碩士論文, 國立臺灣科技大學, 臺北 (2008)。
[13] 陳奕帆, 「多載波被動式射頻辨識系統研究」, 碩士論文, 國立臺灣科技大學, 臺北 (2007)。
[14] Z. Zhu., "RFID Analog Front End Design Tutorial" Available: http://autoidlabs.eleceng.adelaide.edu.au/Tutorial/RFIDanadesign.pdf, 2004.
[15] "Wireless, RF SAW Filter,802-RF927.0M-B," OSCILENT Corporation, Jan. 2010.