Abstract: A wideband communication method based on single-sideband time-modulated array (TMA) is proposed in this paper. This method greatly reduces the sideband level of multi-order harmonic signals within the main beam range by optimizing modulation timing sequence, thus effectively reducing the interference of in-band aliasing introduced by harmonics, and improving available bandwidth. Furthermore, based on the actual shortest switching time of the device, the minimum duty cycle length of the modulation sequence within a unit cycle is optimized to effectively improve the actual transmission bandwidth of the system. The simulation and experiment results verify the effectiveness of the proposed method in wideband communication, and the application range of time modulation technology in wideband systems is improved.