Techniques for focusing the energy radiated by a wireless power transmitting unit are described. An example power transmitting unit includes a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area. The power transmitting unit also includes a power generating circuitry to deliver current to the transmit coil to generate the magnetic field. The power transmitting unit also includes a ferrite structure disposed below the transmit coil, the ferrite structure comprising a flat sheet and a projection of ferrite material projecting above the flat sheet.