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Application note
COMPANY PUBLIC
Rev. 1.1 — 19 June 2018
345311
(1) k = coupling coefficient
Fig 2. Magnetic coupling between reader (PCD) and card (PICC)
According to the ISO/IEC 14443 the PICC antenna coils can be categorized into the
classes 1 …6, as shown in Fig 3.
The PCD antenna is not defined as such, but the PCD must support the classes 1, 2, and
3. The support of the classes 4, 5, and 6 is optional.
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