NXP Semiconductors PN5180 - Design Guide Manual

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AN11740

PN5180 Antenna design guide

Rev. 1.1 — 19 June 2018

345311

Application note

COMPANY PUBLIC

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Content

Keywords

PN5180, Antenna design, Antenna tuning

Abstract

This document describes the “standard” antenna design and tuning

related to the PN5180.

Main Page

Contact Information2
Dynamic Power Control3
Introduction3
NFC Reader Antenna Design3
Fig 1. NFC Communication Modes4
- ISO/IEC 14443 Specifics4
Fig 2. Magnetic Coupling between Reader (PCD) and Card (PICC)5
Fig 3. PICC Classes According to the ISO/IEC 144436
Fig 4. ISO/IEC 10373-6 Referencepicc7
Fig 5. ISO/IEC 10373-6 Reference PICC Class 17
- Field Strength Tests8
- Wave Shape Tests8
- Load Modulation Tests8
- Emvco Specifics9
- Emvco Operating Volume9
Fig 6. Emvco POS Operating Volume Requirement10
- Emvco Field Strength10
Fig 7. Emvco POS Reader Antenna Size11
- Emvco Wave Shapes11
- Emvco Load Modulation11
Fig 8. NFC Forum Operating Volume12
- The NFC Specifics12
- NFC Operating Volume12
Fig 9. PCD & PICC Antenna Coil System13
- Generic PCD Antenna Design Rules13
- Optimum Antenna Coil13
- Number of Turns14
Fig 10. Inductance Examples Versus Coil Radius15
Fig 11. Load Modulation15
Fig 12. Coupling Coefficient Vs PCD Antenna Radius16
- Optimum Antenna Coil Size16
Fig 13. Maximum Coupling Vs Antenna Size17
Fig 14. Operating Distance X Versus Antenna Size18
Fig 15. Magnitude of Field Strength in 1 CM Distance19
- Layout Recommendations19
Fig 16. PN5180 Layout Reference Board Top Layer20
Fig 17. PN5180 Layout Reference Board Bottom Layer21
- PN5180 Hardware Design21
Fig 18. Typical PN5180 Analog Circuit22
Fig 19. Antenna Circuit22
- PN5180 Requirements23
Fig 20. ITVDD Versus Antenna Impedance24
- Antenna for Reader Mode24
- Antenna Matching24
Fig 21. PN5180 Reader Only Antenna Matching Circuit25
- Measure the Antenna Coil25
Fig 22. Measurement 1 Antenna Coil of PN512 Blueboard26
Fig 23. Measurement 2 Antenna Coil of PN512 Blueboard26
- Define Target Impedance and Q-Factor27
- Define the EMC Filter28
Fig 24. Tuning Options29
- Calculate the Matching Components30
Fig 25. Antenna Matching Calculation (Asymmetrical Tuning)31
- Simulate the Matching31
Fig 26. RFSIM99 Schematic32
Fig 27. RFSIM99 Simulation Result33
Fig 28. Impedance Measurement Example34
- Assembly and Measurement34
Fig 29. Measurement Result of First Assembly35
- Impedance Adaptation in Simulation35
Fig 30. Impedance Adaptation in the Simulation (Result)36
Fig 31. Impedance Adaptation in the Simulation (Circuit)36
Fig 32. Final Tuning Simulation37
- Impedance Correction and Assembly37
Fig 33. Final Tuning Measurement Result38
- Loading Effect38
- Passive" Loading with Referencepiccs38
Fig 34. Antenna Impedance Example with Reference PICC Loading39
- Passive" Loading with Metal39
Fig 35. Antenna Impedance Example with Smart Phone Loading40
- Active" Loading40
- Antenna for All NFC Modes40
Fig 36. RM Antenna Matching with Low and High Impedance41
- Antenna Tuning for RM and CM41
Fig 37. NFC Antenna in RM42
Fig 38. Impedance of the NFC Antenna in RM42
Fig 39. NFC Antenna in CM43
Fig 40. Impedance of NFC Antenna in CM43
- Optimizing the Transmitting44
- Modulation Pulse Width44
- Type B Modulation Index44
Fig 41. TX_CLK_MODE_RM45
- Tx Envelope Shape45
- Tx_Clk_Mode45
Fig 42. Tx Envelope Shaping46
- Optimizing the Receiving46
Fig 43. PN5180 Rx Block Diagram47
- External Rx Components47
- Test and Debugging48
- Digital Test Signals48
- Analog Test Signals48
- Example Type B49
Fig 44. Type B Response with Test Signals50
Fig 45. Test Signals for Type B, Comparison of Rxgain51
Fig 46. Test Signals for Type B, Comparison of HPCF51
Fig 47. Type B Without Card Response52
- Noise Check52
Fig 48. Type B with Card Response53
Fig 49. Examples of Vector Network Analyzers54
- Annex54
- Vector Network Analyzer54
Fig 50. VNA/J from DL2SBA (Refer to [13])55
Fig 51. Impedance Measurement Result Example (Smith Chart)55
- Impedance Measurement56
- Calibration56
Fig 52. Measurement Connector and Calibration Kit57
Fig 53. Calibration Result57
- References58
- Definitions59
- Disclaimers59
- Legal Information59
- Licenses59
- Trademarks59
- Table of Contents60
- List of Figures60
- List of Tables61
- Contents62

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