A wireless energy transmission system includes a wireless energy transmitting device and a wireless energy receiving device configured to receive power from the wireless energy transmitting device through a magnetic field. The wireless energy transmitting device includes a signal generator configured to include a resonator including at least one inductor and at least one capacitor and to generate at least two signals having a 90-degree phase difference from each other. The wireless energy receiving device includes a frequency adjustor configured to match a frequency between the wireless energy transmitting device and the wireless energy receiving device.