Abstract: An integrated circuit for a wireless charging device is configured to communicate with a receiver device using near field communication (NFC). The integrated circuit is configured to determine one or more processing response times of the receiver device based on the communication and determine if the receiver device comprises a passive NFC tag or a powered NFC device based on the one or more processing response times.

Abstract: A communication antenna comprising an inner antenna loop extending within a plane, configured to allow a current to flow along a first inner wire and a second inner wire. The communication antenna also comprises, an outer antenna loop extending around the inner antenna loop within the plane, configured to allow a current to flow along an outer wire. The communication antenna further comprises, a plurality of transistors configured to be controlled by a first control voltage and a second control voltage selectively to switch between, a first state which produces current flow in the first inner wire that is in phase with the current in the outer wire; and a second state which produces current flow in the second inner wire that is out of phase with the current in the outer wire. The plurality of transistors is coupled between the outer antenna loop and the inner antenna loop.

Abstract: In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: an NFC circuit; a matching circuit operatively coupled to the NFC circuit; a first antenna and a second antenna; a first switch operable in a first state and in a second state, said first switch being configured to connect a first end of the first antenna to a first end of the second antenna when operated in the first state, and to connect said first end of the first antenna to the matching circuit when operated in the second state. In accordance with a second aspect of the present disclosure, a corresponding method of implementing a near field communication (NFC) device is conceived.