Appendix 4 Study of Modulation/Metallic Interference - Report 2527CR1
Investigation into the Effect of Acoustic/Mechanical Interference on Radio Frequency Identity ( RFID) Systems used to Identify Animals Electronically
Characterisation of Magnetic Field and Tag Readability With and Without the Presence of Metallic Structures
Contents
List of terms and abbreviations
Executive summary
1 Introduction
1.1 Background
1.2 Test Samples
1.3 Scope of this study
1.3.1 Panel reader without the presence of metallic structure (kiosk, race type structure)
1.3.2 Panel reader mounted on the metallic structure (kiosk, race type structure)
2 Preliminary Investigation and Test Setup
2.1 Magnetic Field Distribution
2.1.1 Test Method
2.1.2 Test Equipment
2.2 Antenna Reading Distance
2.2.1 Test Method
2.3 Effect of moving metal fencing on tag readability
2.3.1 Test method
2.4 Bandwidth and Q-factor Measurement
2.4.1 Test Method
2.5 Tag Loading
2.5.1 Test Method
3 Results
3.1 Magnetic Field Distribution
3.1.1 Sample 1
3.1.2 Sample 2
3.1.3 Sample 3
3.1.4 Sample 4
3.1.5 Conclusion
3.1.5.1 Sample 1
3.1.5.2 Sample 2
3.1.5.3 Sample 3
3.1.5.4 Sample 4
3.2 Magnetic Field Distribution Around Centre Section
3.2.1 Conclusion
3.3 Antenna Reading Distance
3.3.1 Sample 1
3.3.2 Sample 2
3.3.3 Sample 3
3.3.4 Sample 4
3.3.5 Conclusion
3.3.5.1 Sample 1
3.3.5.2 Sample 2
3.3.5.3 Sample 3
3.3.5.4 Sample 4
3.4 Effect of moving metal fencing on tag readability
3.4.1 Results
3.4.2 Conclusion
3.5 Bandwidth and Q-factor Measurement
3.5.1 Results
3.5.1.1 Sample 1
3.5.1.2 Sample 2
3.5.1.3 Sample 3
3.5.1.4 Sample 4
3.5.2 Conclusion
3.6 Tag Loading
3.6.1 Results
3.6.1.1 Sample 1
3.6.1.2 Sample 2
3.6.1.3 Sample 3
3.6.1.4 Sample 4
3.6.2 Conclusion
3.6.2.1 Sample 1
3.6.2.2 Sample 2
3.6.2.3 Sample 3
3.6.2.4 Sample 4
3.7 Overall Conclusions
3.7.1 Study 1
3.7.2 Study 2
3.7.3 Study 3
3.7.4 Study 4
References
Appendix 1 - Magnetic Field Distribution
Appendix 2 - Antenna Reading Distance
List of Tables
Table 1 Sample 1 Tag loading
Table 2 Sample 2 Tag loading
Table 3 Sample 3 Tag loading
Table 4 Sample 4 Tag loading
List of Figures
Figure 1.21 Tubular fencing kiosk used for the purpose of this study
Figure 2.1.11: Magnetic Field Measurement Grid
Figure 2.1.12: Antenna orientation for the three axis measurements, X, Y and Z
Figure 2.1.21: Typical Analyser display of the RFID magnetic field (1kHz RBW)
Figure 2.3.11 Plan View of steel gate moving in the magnetic field
Figure 2.5.11 Tag spacing and order added
Figure 3.1.11: Sample 1 - Hx plot, sample on bench
Figure 3.1.12: Sample 1 - Hx plot, sample attached to kiosk
Figure 3.1.13: Sample 1 - Hy plot, sample on bench
Figure 3.1.14: Sample 1 - Hy plot, sample attached to kiosk
Figure 3.1.15: Sample 1 - Hz plot, sample on bench
Figure 3.1.16: Sample 1 - Hz plot, sample attached to kiosk
Figure 3.1.21: Sample 2 - Hx plot, sample on bench
Figure 3.1.22: Sample 2 - Hx plot, sample attached to kiosk
Figure 3.1.23: Sample 2 - Hy plot, sample on bench
Figure 3.1.24: Sample 2 - Hy plot, sample attached to kiosk
Figure 3.1.25: Sample 2 - Hz plot, sample on bench
Figure 3.1.26: Sample 2 - Hz plot, sample attached to kiosk
Figure 3.1.31: Sample 3 - Hx plot, sample on bench
Figure 3.1.32: Sample 3 - Hx plot, sample attached to kiosk
Figure 3.1.33: Sample 3 - Hy plot, sample on bench
Figure 3.1.34: Sample 3 - Hy plot, sample attached to kiosk
Figure 3.1.35: Sample 3 - Hz plot, sample on bench
Figure 3.1.36: Sample 3 - Hz plot, sample attached to kiosk
Figure 3.1.41: Sample 4 - Hx plot, sample on bench
Figure 3.1.42: Sample 4 - Hx plot, sample attached to kiosk
Figure 3.1.43: Sample 4 - Hy plot, sample on bench
Figure 3.1.44: Sample 4 - Hy plot, sample attached to kiosk
Figure 3.1.45: Sample 4 - Hz plot, sample on bench
Figure 3.1.46: Sample 4 - Hz plot, sample attached to kiosk
Figure 3.1.51: Sample 1 - Hy plot, sample on bench +15cm, Centre, -15cm
Figure 3.1.52: Sample 2 - Hy plot, sample on bench +15cm, Centre, -15cm
Figure 3.1.53: Sample 3 - Hy plot, sample on bench +15cm, Centre, -15cm
Figure 3.1.54: Sample 4 - Hy plot, sample on bench +15cm, Centre, -15cm
Figure 3.3.11: Sample 1 - X-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.12: Sample 1 - Y-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.13: Sample 1 - Z-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.21: Sample 2 - X-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.22: Sample 2 - Y-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.23: Sample 2 - Z-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.31: Sample 3 - X-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.32: Sample 3 - Y-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.33: Sample 3 - Z-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.41: Sample 4 - X-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.42: Sample 4 - Y-axis - Antenna reading distance (bench/kiosk)
Figure 3.3.43: Sample 4 - Z-axis - Antenna reading distance (bench/kiosk)
Figure 3.5.21 Analyser Display at 30Hz RBW
Figure 3.5.22 Analyser Display at 200Hz RBW
Figure 3.5.23 Analyser Display at 1kHz RBW
Figure 3.5.24 Variation in loop current response with increasing coupling factor k