Charger with two coils for wireless charging

A system comprising a power device and a portable device, wherein the portable device comprises a battery and the power device is configured to wireless charge the battery of the portable device, the power device comprises a first antenna to emit a magnetic field and the portable device comprises a portable antenna exposed to the magnetic field and connected to a charge stage to rectify an antenna signal from the portable antenna and to provide a charge voltage (UI) to charge the battery characterized in, that the power device comprises a second antenna realized identical as the first antenna and arranged in a distance (L) to the first antenna and on the same coil axis (A) as the first antenna to generate a Helmholtz magnetic field and wherein a first power amplifier directly connected to the first antenna and a second power amplifier directly connected to the second antenna are realized identical and on the same substrate, wherein the first power amplifier and the second power amplifier are realized in CMOS residing on the same monolithic silicon substrate and operating at low voltages of 3.6V.