Is it feasible to use those flexible, low profile antennas that are typically used in smartphones?
I'm thinking in the context of both regular nfc boards and the Keyduino. I realize I would have to add the proper connector. Thanks!
If your antenna + according circuit is matched at 13.56Mhz, there are no problem but I think it will be difficult to find an antenna that match with the according circuit currently on the keyduino and you will need to change some component value to improve your reading range ;)