NXP Semiconductors
AN11740
PN5180 Antenna design
AN11740
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Application note
COMPANY PUBLIC
Rev. 1.1 — 19 June 2018
345311
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(1) Details see [6].
Fig 6.
EMVCo POS operating volume requirement
Within this volume the given parameters need to be fulfilled.
2.2.2 EMVCo field strength
For the field strength test, it is preferred to have the PCD send a continuous carrier, i.e. it
performs no modulation.
The voltage level which can be measured in all of the given positions needs to be
between the minimum and maximum limit, as given in [6].
Due to the operating volume it can become challenging to meet the EMVCo
requirements with small antennas.
The Fig 7 shows the required power versus antenna size. The curve is based on a
antenna simulation, which uses a few simplifications, so it does not take the loading
effect of the EMVCo Reference PICC into account. On the other the simulation was done
under ideal environmental conditions, i.e. no metal environment influences the antenna.
The simulation results can be taken as reference to estimate the design effort especially
for small antennas compared to “normal” antenna sizes.
