Communication antenna device, able to be placed in a vehicle door, or in a device for charging portable equipment located in a vehicle passenger compartment, for communicating with an antenna of a portable device, said antenna device including: • a communication antenna including at least two parts, a first part, comprising a maximum number of primary windings (E1 MAX) of copper wires and a second part comprising a maximum number of secondary windings (E2 MAX) of copper wires, said two parts being connected to each other by a first switching means, • a microcontroller electrically connected to said antenna, managing the communication between the communication antenna and the antenna of the portable device, said antenna device being characterized in that it further includes: • control means integrated into the microcontroller, • at least one second switching means including a plurality of switches (S1 1, S1 2... S1 MAX), which means is controlled by the control means, each switch being located between the microcontroller, and each primary winding (E1 i) of the first part and allowing a determined number of primary windings (E1 i) of the first part to be connected to the microcontroller, and • at least one third switching means including a plurality of switches (S2 1, S2 2... S2 MAX), which means is controlled by the control means, each switch being located between the microcontroller, and each secondary winding (E2 j) of the second part and allowing a determined number of secondary windings (E2 j) of the second part to be connected to the microcontroller, • the first switching means, comprising two sets of switches (S A1, S A2), a first set of switches (S A1) located between the microcontroller and the first part and a second set of switches (S A2) located between the microcontroller and the second part, which means is controlled by the control means, allowing the first part and/or the second part to be connected to the microcontroller, • a communication antenna including at least two parts, a first part, comprising a maximum number of primary windings (E1 MAX) of copper wires and a second part comprising a maximum number of secondary windings (E2 MAX) of copper wires, said two parts being connected to each other by a first switching means, • a microcontroller electrically connected to said antenna, managing the communication between the communication antenna and the antenna of the portable device, • control means integrated into the microcontroller, • at least one second switching means including a plurality of switches (S1 1, S1 2... S1 MAX), which means is controlled by the control means, each switch being located between the microcontroller, and each primary winding (E1 i) of the first part and allowing a determined number of primary windings (E1 i) of the first part to be connected to the microcontroller, and • at least one third switching means including a plurality of switches (S2 1, S2 2... S2 MAX), which means is controlled by the control means, each switch being located between the microcontroller, and each secondary winding (E2 j) of the second part and allowing a determined number of secondary windings (E2 j) of the second part to be connected to the microcontroller, • the first switching means, comprising two sets of switches (S A1, S A2), a first set of switches (S A1) located between the microcontroller and the first part and a second set of switches (S A2) located between the microcontroller and the second part, which means is controlled by the control means, allowing the first part and/or the second part to be connected to the microcontroller,