I have an NFC tag application that uses an external antenna. The antenna itself has not been properly selected just yet, but my question is with regards to connecting the external antenna to the NFC tag.
NFC Tag is the NXP I2C Plus chip - https://www.nxp.com/docs/en/data-sheet/NT3H2111_2211.pdf
A high-level overview diagram is shown below.
The antenna ports appear to be balanced but I don't know for sure.
Have 2 pads where I can solder some wire to and run up to the external antenna.
- Twisted pair vs not?
Add a u.fl connector or similar RF connector and use that to connect to the external antenna.
- Would I need a balun or can I connect it straight?