FXR.08.52.0075X.A Datasheet, PDF (6/10 Pages) Taoglas antenna solutions – Flexible Low Profile Embedded Antenna

3.3. Matching
The interrogation distances presented here were taken with the antenna connected
directly to the evaluation boards with the default matching circuit. This is not
necessarily the optimal matching circuit that could be designed for a particular
antenna. We kept the default matching of each evaluation board to minimize the
number of variables in testing and keep integration as simple as possible.
As with any matching network the exact circuit and values for an optimal network
depend on the combination of antenna, NFC circuit, any intervening transmission line
and the environment presented to the antenna. These factors are specific to the
particular end product.
As a starting point, to achieve the read range results presented here, use the
matching network detailed in the schematic of the evaluation board for your particular
NFC chip and keep the antenna free of any obstruction. Once you can demonstrate
successful reads you can then optimize performance as desired.
If the matching network is required, you should implement the following topology:
The matching circuit should be designed to match the IC impedance 𝑍_"# to 100Ω and
then connect the antenna through a 100Ω differential pair.
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