RFID Antenna Design(2006)

Dr. Xiuping LiAssociate Professor Beijing University of Posts and TelecommunicationsEmail: xpli@bupt.edu.cn

Tel:010-62282900

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Outline RFID Antenna Overview

Academic publicationTag antenna structureEnvironmental effects on RFID tag antenna

Patents

RFID Antenna Design in BUPT UHF&MW band tag antenna Design ANN modeling in antenna design Research on environmental effects Multi-band reader antenna

Conclusion

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RFID Antenna Overview

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RFID Tag Antenna RFID Reader Antenna Work frequency

LF,HF UHF,MW

Antenna Types Wire Antennas Aperture Antennas Microstrip Antennas Array Antennas ……

Classification

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RFID system operation

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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

Design requirement met?

Design Is ready

YesNo

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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.

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Major Consideration

The type of antenna Its impedance RF performance when applied to the object RF performance when the object has other s

tructures 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.

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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.

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RFID Tag Antenna Design(2)

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

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RFID Tag Antenna Design(3)

Planar inverted-F antenna for radio frequency identification

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RFID Tag Antenna Design(4)

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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

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RFID Antenna Patents Annual increasing amount is 183.6 from 200

1-2005, 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

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Developing Trends

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Region Distribution

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Patents for RFID Tag Antenna

Increase 300% from 2000 to 2005

Conductive transponder loop Vehicle transponder tracking

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Developing Trends

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Region Distribution

RFID patents report: Ministry of information industry software

and integrated circuit promotion center (CSIP)

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RFID Antenna Design in BUPT

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UHF&MW band Antenna Design Research on Environmental Effects ANN modeling in Antenna design

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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.

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-60

-50

-40

-30

-20

-10

0

2 2.2 2.4 2.6 2.8 3

Freq(GHz)

S11(

dB)

Simulated Results Measured Results

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-40

-30

-20

-10

0

-90 -60 -30 0 30 60 90

Theta

(dB

)

Measured ResultsSimulated Results

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Water in Glass bottle

-50

-40

-30

-20

-10

0

2.0 2.2 2.4 2.6 2.8 3.0

Frequency (GHz)

|S11

| dB

ANT ANTG5 ANTG2P5

ANTG6 ANTGP3

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Water in Plastic bottle

-50

-40

-30

-20

-10

0

2.0 2.2 2.4 2.6 2.8 3.0

Frequency (GHz)

|S11

| dB

ANT ANTP5 ANTP2P5

ANTP6 ANTPP3

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Metal Can

-60

-50

-40

-30

-20

-10

0

2.0 2.2 2.4 2.6 2.8 3.0

Frequency (GHz)

|S11

| dB

ANT ANTM5 ANTM2P5

ANTM6 ANTMP3

Xiuping Li, Yu Liu,Printed Dipole Antenna Measurement Effect by Environment for RFID Application , Accepted by eletronics devices.

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Inverted-F antenna design

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UHF Antenna Design

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Artificial Neural Network

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-40

-30

-20

-10

0

2.0 2.2 2.4 2.6 2.8 3.0

Frequency(GHz)

|S11

|(dB

)

ANN Modeled resultsEM Simulated results

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-150

-100

-50

0

50

2.0 2.2 2.4 2.6 2.8 3.0

Frequency(GHz)

S11

_pha

se(d

egre

e)

(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.

ANN Modeled resultsEM Simulated results

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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

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ThanksThanks ！！