The modern platforms capable of generating uniform magnetic fields for wireless charging multiple electronic devices have attracted considerable interest in the wireless power transfer realm. This paper proposes a metasurface-based transmitting resonator consisting of two orthogonally placed parallel copper wires layers separated by a high permittivity dielectric layer. The proposed structure of the transmitting resonator allows for generating a uniform magnetic field above the surface. The theoretically estimated minimum coefficient of magnetic field variation is 8.2 % over the central resonator working area with the size of 30 cm × 30 cm, which is sufficient to charge several devices at once. The calculated maximum achievable power transfer efficiency reaches 93.4 %. The simulated value of the resonator’s peak specific absorption rate is twice decreased compared to other metasurface-based designs. The proposed structure could transfer more power under the same safety limitation.