Stationary wireless charging, where the position of the receiver is fixed, has been widely used, like high-end smartphones. As for dynamic wireless charging (DWC) technology, devices, such as electric vehicles and automated guided vehicles, can be wirelessly charged when they are moving. Therefore, working efficiency can be improved dramatically. One of the most important issues for DWC technology is to optimize the coupler. A good transmitting coil array can generate a uniform magnetic field, which means a lower fluctuation in system output. In this paper, a T-shaped transmitting coil array is proposed for the DWC system, which features a lower output variation and is convenient for splicing and extending. The finite element simulation illustrates that the magnetic flux density of the T-shaped transmitting coil array is more uniform than that of the traditional square transmitting coil array. In addition, experimental results show that the output voltage variation of the T-shaped transmitting coil array is 13%.