When I put a piece of aluminum foil underneath an RFID card, the RFID reader is unable to read the card when it's placed in front of it like this (or around it):
The reader IS able to read the card when it is at this distance WITHOUT the aluminum foil underneath.
The only way I could get the reader to read the card with aluminum foil underneath was when I put the card directly below it like this:
- What is going on to make it work this way?
- Could it be the antenna's configuration on the RFID reader? The RFID card? or both?