科技英文報告 compact printed-on-cd uhf rfid tag antennas 指導老師 : 余英松 老師 學...

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

CATALOGUE

I. Introduction

II. Body

III. Conclusion

I. INTRODUCTION

RFID工作原理

Antenna HF Micro Controller Host Computer

Reader

Data Energy

RFID Tag

天線晶片的匹配理論

根據 Friis free-space equation ，

讀取距離 r 為

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

ccc jXRZ

2c4

ac

a

ZZ

RR

10

aaa jXRZ

th

rtt

P

PGGPr

4

(a)

(b)

圖 1 天線與晶片阻抗與匹配圖 [5]

5

KINDS OF RFID

(Read-only Chips) (write one time/Read many times) (With Read-Write Chips) (Passive Tag) (Semi-Passive Tag) (Active Tags)

Advantage of

RFID

Unnecessaryto be

Invisible

High Reading

pace

High durability

Large data

Overwrite

Long read range

RFID的優點

RFID的缺點

Shortcoming ofRFID

High cost

Signal interference

Weakly Signal

Read rate

可應用層面

悠遊卡 [2]、門禁的管制 [3]、國道 eTag系統

II. BODY

EXPERIMENT SETUP

Printed-On-CD UHF RFID Goal :

a UHF RFID that is diameter smaller then 33.5mm also avoid the influence

from metallization.

3 main points :1. Tag antenna design2. Tag antenna EM simulation3. Measured tag antenna performance

TAG ANTENNA DESIGN

TAG ANTENNA EM SIMULATION

Fig. 2. Calculated current densities on the meander-type tag antenna left. printed on dielectric substrateright. printed on the same tag on CD with metal

MEASURED TAG ANTENNA PERFORMANCE

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

MEASURED TAG ANTENNA PERFORMANCE

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.

REFERENCE

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

Thanks for your attention