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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