US Patent 10994191 Resonant coils for use with games and toys

An electronic card game system and method using NFC or RFID electromagnetic communication, including an initiator having a driving coil, a first card having a secondary coil with a capacitor, and a playing piece having a receiving coil. The initiator and the first card may be placed on a playing surface so that at least a portion of the driving coil and at least a portion of the secondary coil overlap. Similarly, the first card and the playing piece may be placed on a playing surface so that at least a portion of the receiving coil and at least a second portion of the secondary coil overlap. These overlapped coils allow a driving signal initiated at the driving coil to be transmitted through the secondary coil and received by the receiving coil.