HF Antenna Cookbook.pdf

HF Antenna Cookbook

Technical Application Report

11-08-26-001 March 2001

Radio Frequency Identification Systems

Lit. Number 11-08-26-001

Contents

Edition One – March 2001 .................................................................................................... i

About this Manual ................................................................................................................ ii

Conventions ......................................................................................................................... ii

If You Need Assistance....................................................................................................... ii

Abstract ................................................................................................................................ 1

1 Construction Details...................................................................................................... 2

1.1 Copper Tape ............................................................................................................. 2

1.2 Copper Tube ............................................................................................................. 3

1.2.1 Mounting tuning components ............................................................................................. 3

2 Copper Tube Antenna (500mm x 500mm).................................................................... 4

2.1.1 Gamma matching the Antenna........................................................................................... 5

3 Tape Antenna (550mm x 800mm) ................................................................................. 6

3.1 Tape Antenna tuning circuit....................................................................................... 6

3.2 Tape antenna T Matching ......................................................................................... 7

3.2.1 Method to locate the matching point .................................................................................. 7

4 Twin Loop Antenna (2 x 500mm x 500mm).................................................................. 8

4.1 Twin loop Matching & Tuning Circuit with BALUN ..................................................... 9

4.2 Antenna / Transmitter Matching with BALUN .......................................................... 10

4.2.1 How to construct a Matching Balun.................................................................................. 10

5 Small Round Antenna ................................................................................................. 12

6 Spiral Antenna ............................................................................................................. 13

6.1 Spiral Antenna construction details ......................................................................... 13

7 Conclusion................................................................................................................... 14

References ......................................................................................................................... 14

Figures

Figure 1. Copper tape folded and soldered ......................................................................... 2

Figure 2. Picture showing copper tube and the joining material ....................................... 3

Figure 3. Assembled Copper Tube end................................................................................ 3

Figure 4. Copper Tube Antenna 500mm x 500mm .............................................................. 4

Figure 5. Resonance Tuning Components .......................................................................... 4

Figure 6. Gamma Matched Antenna ..................................................................................... 5

Figure 7. Tape Antenna (550mm x 800mm) ......................................................................... 6

Figure 8. Tape antenna tuning components ........................................................................ 6

Figure 9. Tape antenna T matching...................................................................................... 7

Figure 10. Twin-loop Antenna.............................................................................................. 8

Figure 11. Tuning circuit ...................................................................................................... 9

Figure 12. Antenna Transmitter Matching using a BALUN................................................ 10

Figure 13. Example BALUN Matching Network .................................................................. 10

Figure 14. Small Round antenna ......................................................................................... 12

Figure 15. Small Round Antenna Tuning circuit ................................................................ 12

Figure 16. Spiral Antenna .................................................................................................... 13

Figure 17. Capacitive matching Board................................................................................ 13

Figure 18. Roller Conveyor Read Gate................................................................................ 14

Lit. Number 11-08-26-001

Edition One – March 2001

This is the first edition of this Technical Application Report called HF Antenna Cookbook.

It contains descriptions of how to build and tune antennas for use at 13.56MHz and should be

used in conjunction with:

Tag-it™ S6000 and S6500 Readers

This document has been created to help support Texas Instruments’

Customers in designing in and /or using TI*RFID products for their chosen

application. Texas Instruments does not warrant that its products will be

suitable for the application and it is the responsibility of the Customer to

ensure that these products meet their needs, including conformance to

any relevant regulatory requirements.

Texas Instruments (TI) reserves the right to make changes to its products

or services or to discontinue any product or service at any time without

notice. TI provides customer assistance in various technical areas, but

does not have full access to data concerning the use and applications of

customers’ products.

Therefore, TI assumes no liability and is not responsible for Customer

applications or product or software design or performance relating to

systems or applications incorporating TI products. In addition, TI assumes

no liability and is not responsible for infringement of patents and / or any

other intellectual or industrial property rights of third parties, which may

result from assistance provided by TI.

TI products are not designed, intended, authorized or warranted to be

suitable for life support applications or any other life critical applications

which could involve potential risk of death, personal injury or severe

property or environmental damage.

TIRIS and TI*RFID logos, the words TI*RFID™ and Tag-it™ are trademarks or registered

trademarks of Texas Instruments Incorporated (TI).

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