RFID Antenna Design 2006

1
RFID Antenna Design(2006)

• Dr. Xiuping Li
• Associate Professor
• Beijing University of Posts and
  Telecommunications
• Email xpli_at_bupt.edu.cn
• Tel[phone]

2
Outline

• RFID Antenna Overview
• Academic publication
• Tag antenna structure
• Environmental effects on RFID tag antenna
• Patents
• RFID Antenna Design in BUPT
• UHFMW band tag antenna Design
• ANN modeling in antenna design
• Research on environmental effects
• Multi-band reader antenna
• Conclusion

3
RFID Antenna Overview
4
Classification

• RFID Tag Antenna
• RFID Reader Antenna
• Work frequency
• LF,HF
• UHF,MW
• Antenna Types
• Wire Antennas
• Aperture Antennas
• Microstrip Antennas
• Array Antennas

5
RFID system operation
6
RFID Tag Antenna Design Process
Select the application and define the requirement
Determine the materials for antenna construction
Determine RF impedance of packaged ASIC
Identify the type of antenna and its parameters
Perform parametric study and optimization
Build and measure prototypes
Yes
No
7
Requirement for RFID Tag Antenna

• Small enough
• Direction
• Must provide maximum possible signal to ASIC
• Polarization
• Be robust
• Be very cheap
• Copper, aluminum, and silver ink
• flexible polyester and rigid PCB substrates like
  FR4.

8
Major Consideration

• The type of antenna
• Its impedance
• RF performance when applied to the object
• RF performance when the object has other
  structures around it
• P.Foster and R.Burberry, Antenna problems in
  RFID systems IEEE colloquium on RFID Technology,
  pp.3/1-3/5, 25 Oct 1999.

9
RFID Tag Antenna Design(1)

• Type improvement
• Gain-optimized self-resonant meander line
  antennas for RFID applications
• Genetic algorithms
• Best tradeoff between wire length minimization
  and best current utilization.
• Self-resonant simplify the matching network and
  obtain low-cost tags.

10
RFID Tag Antenna Design(2)

• CPW-fed folded-slot antenna for 5.8 GHz RFID tags

11
RFID Tag Antenna Design(3)

• Planar inverted-F antenna for radio frequency
  identification

12
RFID Tag Antenna Design(4)
13
Environmental Effects

• Daniel M.Dobkin and Steven M.Weigand,
  Environmental Effects on RFID Tag Antennas,
  2005 IEEE APS,pp.135-138.
• Study on the influence of curving of tag antenna
  on performance of RFID

14
RFID Antenna Patents

• Annual increasing amount is 183.6 from 2001-2005,
  
• 11.4 from 1991 to 1995, 39.4 from 1996 to 2000
• More than 50 - US patents every year
• The application amount from Jan 2006 to Aug
  2006is around 88.3 of that in 2005

15
Developing Trends
16
Region Distribution
17
Patents for RFID Tag Antenna

• Increase 300 from 2000 to 2005
• Conductive transponder loop
• Vehicle transponder tracking

18
Developing Trends
19
Region Distribution
RFID patents report Ministry of information
industry software and integrated circuit
promotion center (CSIP)
20
RFID Antenna Design in BUPT
21

• UHFMW band Antenna Design
• Research on Environmental Effects
• ANN modeling in Antenna design

22
RFID Antenna Design
Xiuping Li, Yu Liu, Haiying Cao, Minimized
Printed Dipole Antenna Design Based on RFID
Application, Journal of Beijing University of
Posts and Telecommunications, 2006.10, Vol.29,
No.5, 75-78.
23
(No Transcript)
24
(No Transcript)
25
Water in Glass bottle
26
Water in Plastic bottle
27
Metal Can
Xiuping Li, Yu Liu,Printed Dipole Antenna
Measurement Effect by Environment for RFID
Application , Accepted by eletronics devices.
28
Inverted-F antenna design
29
UHF Antenna Design
30
Artificial Neural Network
31
(No Transcript)
32
(No Transcript)
33
(Ld 21.4mm, Wd 6mm, Lb 23mm)
Xiuping Li, Jianjun Gao and Georg Boeck, Printed
Dipole Antenna Design by Artificial Neural
Network Modeling for RFID Application,
International Journal of RF and Microwave
Computer-Aided Engineering, Vol.16,No.6, 607-611.
34
Conclusion

• Tag Antenna plays important role in RFID system
• Research based on the RFID system application
  environment
• Hot topic
• Optimized and low cost antenna---Market
  requirement

35
Thanks!