8

SPE-22-8-126-A

www.taoglas.com

3.3

Matching

The interrogation distances presented here were taken with the antenna connected directly to the

evaluation boards with the optimzed matching circuit. For the NXP PN553 chipset, it is sugguesd using

20ohm impendence of the NFC antenna. Just like below:

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.