1. Compact Printed-On-CD UHF RFID Tag Antennas
科技英文報告
Compact Printed-On-CD
UHF RFID Tag Antennas
指導老師:
余英松 老師
學 生:
498L0090 施昶榆
498L0100 李彥勳
498L0101 吳向容
498L0105 陳昶宏
498L0106 高柏翔

2. catalogue
I. Introduction
II. Body
III. Conclusion

3. I. Introduction

4. RFID工作原理 RFID Tag Antenna HF Micro Controller Host Computer Reader
Data
Energy
RFID Tag

5. 天線晶片的匹配理論 ， 根據 Friis free-space equation， 讀取距離 r 為 (a)
Pt 為Reader所放射功率，Gt、Gr 分為
Reader放射與Tag接收天線的增益，
Pth 為最小啟動晶片功率[5]
功率傳輸係數(PTC)為 ，
其中 為晶片阻抗，
為Tag 天線阻抗
(a)
(b)
圖1天線與晶片阻抗與匹配圖[5]

6. Kinds of RFID (Read-only Chips) (write one time/Read many times)
(With Read-Write Chips)
(Passive Tag)
(Semi-Passive Tag)
(Active Tags)

7. RFID的優點 Overwrite Advantage of RFID Unnecessary Invisible to be
Reading
pace
High
High durability
Large data
Overwrite
Long read range

8. RFID的缺點 Signal interference RFID Shortcoming of High cost
Weakly Signal
Read rate

9. 可應用層面
悠遊卡[2]、門禁的管制[3]、國道eTag系統

10. II. Body

11. Experiment setup Printed-On-CD UHF RFID Goal :
a UHF RFID that is diameter smaller then mm also avoid the influence from metallization.
3 main points :
1. Tag antenna design
2. Tag antenna EM simulation
3. Measured tag antenna performance

12. Tag antenna design

13. Tag antenna EM simulation
Fig. 2. Calculated current densities on the meander-type tag antenna left. printed on dielectric substrate
right. printed on the same tag on CD with metal

14. Measured tag antenna performance
Fig. 4. Measured impedance of the meander-type tag antenna and IC chip impedance.

15. Measured tag antenna performance

16. III. Conclusion
The rapid advances in technology, the development and progress of RFID technology is changing people's lifestyles, RFID not only bring people to quickly and convenient, but also declared the star of the wireless communications technology era has arrived, but the life of the application of RFID technology commodities worry is likely related to personal privacy issues, promotion of RFID applications and universality in the future, we also need to grasp the shortcuts and privacy tradeoff, widely used in various fields.

17. reference
Andrey S. Andrenko, “Compact Printed-On-CD UHF RFID Tag Antennas”

18. Thanks for your attention