A power transmitter includes a coil configured to transmit the power signal to a power receiver, the coil formed of wound Litz wire and including a first coil portion and a second coil portion, the second coil portion positioned radially outward of the first coil portion. The power transmitter includes a shielding comprising a first shield portion and a second shield portion. The first shield portion defining a first cavity configured such that the ferrite core substantially surrounds all but the top face of the first coil portion. The second shield portion includes a magnetic backing and a magnetic ring, which, in combination, define a second cavity, the magnetic ring defining a bottom portion, a top portion, and an inner sidewall defining an outward extending shape extending radially outward from the bottom portion to the top portion, the second coil portion positioned within the second cavity.