Abstract: A high power wideband patch antenna array driven by two switched oscillators with synchronism output was designed, so as to increase the radiation factor of the mesoband high power microwave radiator. A single layer patch and an air substrate were employed to reduce the weight of the array, each patch is E-shaped for broadening the bandwidth. Optimization of the arrays geometric parameters was performed to get the highest radiation factor. As a result, the radiation factor is 3.4 times of the magnitude of the feed in mesoband pulse, the percentage of bandwidth is 47%, and the gain of the array is 11.8 dB at frequency of 300 MHz. Filling SF6 gas with a pressure of 1 atm in the nylon-case, the power capability of the array is as high as 7.45 GW. A novel mesoband pulse generator with the two-port synchronous output was provided. The generator has a dual-path sync output wideband resonator structure, in which two resonators share a shorting switch to achieve synchronous output. The design of the generator is optimized, and the coupler has a couple ratio of 0.644 at the frequency of 300 MHz. The simulation comparison between the generators with and without T-shaped charging structure was performed, which shows that the output pulse amplitude of the generator with the charging structure is only 4%, lower than that without the charging structure.