The Manufacture of Transponders and Contactless Smart Cards - RFID: Fundamentals and Applications in Contactless Smart Cards and Identification - page 327

Figure 12.7 Manufacture of a smart card coil using the embedding technique on an inlet foil.
The sonotrodes, the welding electrodes (to the left of the sonotrodes) for contacting the coils,
and some finished transponder coils are visible (reproduced by permission of AmaTech GmbH
& Co. KG, Pfronten)

Figure 12.8 Example of a 13.56MHz smart card coil using screen printing technology

coil resistance of an etched coil can easily be calculated from the surface resistance
R A (Cu: 500

µ /

where d = 35 m).

µ

12.2.2 Connection technique

The different types of antenna also require a different connection technique between
the antenna coil and the transponder chip.