用於手機應用的射頻標籤天線之設計

DESIGN OF RFID TAG ANTENNA FOR MOBILE PHONE APPLICATIONS

卓志忠(Chih-Chung Cho)

指導教授 ： 黃啟芳

大同大學/電機資訊學院/通訊工程研究所/碩士(2008年)

摘要

本論文研究的主要目的是將射頻標籤應用於手機上，探討所設計射頻標籤天線應用於手機外殼上之效能，範圍包括設計高頻及超高頻的無線射頻辨識系統(RFID)標籤天線。 高頻標籤天線是設計工作在13.56MHz，而在915MHz的高頻天線是基於共軛匹配的特性來設計。在本論文中，我們也引用了電路學中共軛匹配的觀念。 我們可以藉由此觀念來在各種不同阻抗下達到最大功率輸出的目的。 即使RFID晶片的實部或虛部阻抗因廠商有所不同，在阻抗匹配的設計之下也能達到最佳效能。
最後，實作的量測上發現結果也能符合我們的預期。 量測結果顯示我們的設計可達商業應用的標準。 而在高頻標籤天線的設計上我們成功的在超薄FR4板上設計出一個射頻標籤天線。 並透過實作與量測得到相當不錯的效能。 我們將其設計出的射頻標籤天線應用於手機上，實作並量測。 結果發現超高頻標籤天線並不適合於手機上的應用，而高頻標籤天線可有不錯的效果。

關鍵字

用於手機應用的射頻標籤天線

並列摘要

The main purpose of this research is to study the application of RFID technology on mobile phone. The scope includes mainly on the assessment of the performance of two designed tags. This study first covers the design and optimization of antenna for RFID Tags both of HF (high Frequency) and UHF (Ultrahigh Frequency) band. The HF band RFID tag antenna designed at 13.56MHz and UHF band RFID tag antenna is designed at 915MHz based on complex conjugate matching concept. Through the complex conjugate matching concept, we can achieve the maximum power transfer for a given impedance.
Finally, the performance of the designed tags on mobile phones is examined. The measured results suggested that our design can reach the commercial requirements. For the design of RFID tags, the antenna at HF band was successfully fabricated on the very thin FR4 board. Good performance was given by the test results. The designed tags then are used on mobile phones for evaluation of the performance. The results show that application of UHF band tags is not suitable for this kind of application. However, favorable performance can be achieved for the HF band tags.

並列關鍵字

RFID TAG ANTENNA FOR MOBILE PHONE

參考文獻

[2] H. Stockman, “Communication by means of reflected power,” Proc. IRE, pp. 1196–1204, Oct. 1948.

[4] F. Dowla (Ed.), “The Basics of Radio Frequency Identification Technology,” Chapter 14 in Handbook of RF and Wireless Technologies, Elsevier, 2004.

[5] J. Siden, P. Jonsson, T. Olsson, and G. Wang, “Performance Degradation of RFID System Due to Distortion in RFID Tag Antenna,” Microwave and Telecommunication Technology, pp.371-373, 2001.

[7] Jing-Qing Zhan, “RFID Tag Antennas Designed by Fractals and Manufactured by Printing Technologies,” Mater Thesis, Institute of Communication Engineering Tatuang University, June 2006

[12] P.H. Cole, D.C. Ranasinghe and B. Jamali, “Coupling Relations in RFID Systems II: Practical Performance Measurements,” Auto-ID Centre White Paper, 2003.