Panasonic
NFC TAG Antenna Design Guide
2
1. Introduction .............................................................................................................................. 3
1.1 Purpose of this Guide ..................................................................................................... 3
2. Designing the Antenna
..................................................................................................... 4
2.1 Antenna Design Flow ..................................................................................................... 4
2.2 Determining the Size of Antenna [STEP 1] ......................................................... 5
2.3 Determining the Specifications of Antenna [STEP 2] .................................... 5
2.3.1 Measurement Results of Communication Distance............................. 6
2.4 Setting up the Antenna Board [STEP 3] ............................................................. 10
2.4.1 Reference Example of Antenna Board .................................................... 11
2.5 Determining Resonant Capacitor Value [STEP 4] ........................................ 12
2.5.1 Measuring Antenna Equivalent Circuit Parameters [STEP 4-1] .. 13
2.5.2 Calculating Resonant Capacitor Value [STEP 4-2] ........................... 14
2.5.2.1 Calculation Example of Resonant Capacitor Value ............. 15
2.5.3 Determining Proper Resonant Capacitor Value [STEP 4-3] ......... 16
2.6 Checking the Operation of NFC Tag [STEP 5] ................................................. 17
2.6.1 Measuring the Communication Distance .................................................. 17
2.6.2 Checking the Voltage of Antenna Pin ......................................................... 18
3. Reference
.................................................................................................................................. 19
3.1 Antenna Class Based on ISO/IEC14443 ............................................................. 19
3.2 Antenna Coil Specifications in NFC Forum ........................................................ 20
3.3 How to Measure the Voltage of Antenna Pin ..................................................... 21
4. Revision History ......................................................................................................................... 22
Contents
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