具獨立讀取識別標籤功能的射頻識別讀卡機之天線設計

DESIGN OF A RFID READER ANTENNA FOR EXCLUSIVELY READING ONE SINGLE TAG

黃怡鳳(Yi-Feng Huang)

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(2009年)

摘要

在於生產RFID Tag 時，如何將該微小的晶片快速可靠的與天結合。為了確定Package 完的標籤是良品，RFID Tag 生產設備必須於最後一道工續，以Reader 對標
籤作取驗證。

所以在此篇論文裡，我們針對這個需求設計了兩隻天線。第一隻我們是利用微帶天線的架構去設計，其滿足UHF 頻段( 860~960MHz)的天線，但由於微帶天線最大的缺點就是頻寬較窄，所以在這點我們將利用寄生耦合(parasitic)的方法來達到寬頻的目的。

為了讓設計的reader 可以更準確一次只讀一張RFID Tag，而不讀取相鄰其它之標籤(Neighbour Tags)。為了抑制旁測之Neighbour Tags 有反應，我們將採用吸波材料(EM Shielding sheet)，除了包住其承放之機構，也會壓在其晶片區，以達目的。

第二隻天線則是需要滿足HF(13.56MHz)的天線，由於13.56MHz 的頻率低、波長要長，我們是利用coil antenna 的概念去設計，但因其輸入端為平衡形式，而我們使用的測試儀器則為不平衡形式，所以我們需再設計一個balun 來轉換。

關鍵字

遮蔽材 ； 近場 ； 射頻識別讀卡機 ； 耦合

並列摘要

This thesis presents a design of RFID reader antenna, which is equipped on a
chip-attaching machine producing the RFID tags. Such an antenna is constrained to read exclusively one tag only for the purpose of functional check of the whole tag when it passes the reader antenna, namely, the other neighbor tags on the same rolling band are ignored that time.

We design two reader antennas for UHF and HF band. The first antenna is designed by the concept of Microstrip antenna and used in UHF band(860~960MHz).
But the disadvantage of Micristrip antenna is narrow band; we employed the concept of parasitic to increase frequency band.

Due to meeting the purpose, we depress the response of neighbor tags by magnetic shielding sheets. We also measure proximity field to prove this idea.

The second antenna is used in HF band. Because the wavelength of HF reader
antenna is too long, we design it to use the concept of coil antenna. The coil antenna is balance input device, but the testing instrument is unbalance and balun is designed, too.

並列關鍵字

parasitic ； shielding sheets ； proximity field ； RFID reader

參考文獻

[3] H. Stockman, “Communication by means of reflected power,” Proc. IRE, pp.

1196–1204, Oct. 1948.

[4] R. Bansal, “Coming soon to a Wal-Mart near you,” IEEE Antennas Propag. Mag., vol.45, pp. 105–106, 2003.

[5] S. Sarma, D. Brock, and D. Engels, “Radio frequency identification and the electronic product code,” IEEE Micro, pp. 50-54, 2001.

[6] Chi-Fang Huang and Yi-Feng Huang, “Design of RFID Reader Antenna for