Traveling-wave photodiode arrays can combine the output power of the diodes without increasing the bandwidth. To deal with such problem, a kind of high-performance diode groups traveling-wave photodiode arrays structure was proposed. Firstly, two-element near-ballistic uni-traveling-carrier photodiodes were cascaded, and then parallel these two cascaded branches. After that, we have a capacitor in series on these diode groups to form array units. Then these array units were cascaded and connected with inductors based on traveling-wave detector arrays to constitute new traveling-wave photodiode arrays. The power synthesis, frequency response and return loss of traveling-wave photodiode arrays were analyzed and compared. Under the condition of applying the same amount of diode, the output power of the new traveling-wave photodiode arrays is halved and its cut-off frequency is doubled. In addition, compared to traditional structure, the return loss improves more obviously with the number of diodes in arrays increasing. The results show that this new traveling-wave photodiode arrays structure can increase the output power while improve the working bandwidth, better meet the requirements of high-power and high-bandwidth photodetector in future radio-over-fiber wireless communication.