Electronic device, method and system for half duplex data transmission

An electronic device for half-duplex near field transmission of radio signals comprising:

• a first coil, a second coil and a third coil, being arranged as a three-dimensional antenna each of the coils operating independently of the other;
• a first capacitor, a second capacitor and a third capacitor coupleable in parallel to the first coil, the second coil and the third coil, respectively, for selectively forming a first, a second and a third parallel-resonant circuit for transmitting and receiving radio signals;
• first, second, third series-resonant circuits for transmitting near field radio signals formed by fourth, fifth and sixth capacitors in series with the first, second and third coils, respectively;
• and
• a control stage configured to either use one of the first, second or third parallel-resonant circuits for receiving radio signals and for charging a capacitor to power the electronic device and utilizing a corresponding one of the first, second, third series-resonant circuits for transmitting near field signals.