Texas Instruments 2000 LF Series Manuals

Manuals and User Guides for Texas Instruments 2000 LF Series. We have 1 Texas Instruments 2000 LF Series manual available for free PDF download: Application Note

Texas Instruments 2000 LF Series Application Note

Texas Instruments 2000 LF Series Application Note (38 pages)

Radio Frequency Identification Systems

Brand: Texas Instruments | Category: Antenna | Size: 0 MB

Table of Contents

Table of Contents
3
Edition 1 - March 2003
5
- About this Manual
  6
- Read this First
  6
Abstract
7
1 Why Custom Antennas May be Required

8
2 Standard Antennas

9
3 Fine Tuning Antennas

11
- Tuning to Resonance @ 134.2 Khz
  11
4 Antenna Design

14
- Figure 8. RFM-008B RF Module and ACC-008A Tuning Board
  14
  - Figure 9. the Microreader
    14
  - Determining Self Inductance
    15
    
    By Calculation
    15
    
    Table 1. RF Module Antenna Characteristics
    15
    
    By Measurement
    16
    
    Figure 10. "ADU.EXE" Screen
    16
    
    Figure 11. LCR Meter
    16
  - Antenna Q
    17
    
    Figure 12. High Q Vs. Low Q
    17
    
    Figure 13. LF System Spectrum
    17
    
    By Calculation
    18
    
    By Measurement
    18
    
    Determing the Antenna's Q Value
    18
    
    Figure 14. Spectrum Analyzer Screen
    18
  - Controlling the Antenna's Q
    19
    
    Skin Effect
    19
    
    Wire Selection
    19
    
    Figure 15. Litze Wire (3 Sizes)
    20
    
    Litze Wire
    20
    
    Figure 16. 'Jumbo' Oxygen Free Hi-Fi Wire
    21
    
    Figure 17. Road Loop Wire
    21
    
    Other Wires Used in Antenna Construction
    21
  - Antenna Size
    22
    
    Figure 18. Transformer Wire
    22
    
    Figure 19. Reading Range Reduction Due to Noise
    22
    
    Antenna Size Vs. Inductance
    23
    
    Figure 20. Windings Vs. Inductance
    23
    
    Figure 21. Single Loop Vs. 27 Μh Inductance
    23
    
    Adapting a Non 27Μh Antenna
    24
    
    Figure 22. out of Tune Conditions
    24
    
    Using External Capacitance
    24
    
    Table 2. External Capacitance Values
    25
    
    Figure 23. Polypropylene Capacitor De-Rating
    26
    
    Figure 24. Polypropylene Capacitors (0.01 Μf & 0.47 Μf)
    26
  - Antenna Tails
    27
    
    Figure 25. Antenna Tail Construction
    27
    
    Tail Construction
    27
  - Ferrite Cored Antennas
    28
5 Other Antennas

28
Appendix A - Microreader Antenna Designs

33
Appendix B. Contacts

38

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