Traveling wave detector arrays combine the output power of photodiodes without increasing the operation bandwidth. A arrays photodetector based on multi-photodiodes type T circuit structure was proposed. Capacitor and photodiode were connected in series to reduce the effect of junction capacitance on the cut-off frequency. Then inductor was used to connect each photodiode in order to constitute the circuit structure which was similar to type T filter. The novel arrays not only combine multiple photodiodes output power but also increase operation bandwidth. In addition that the capacitance cascaded in the photodiode branch was equivalent to decrescence of the photodiode junction capacitance. Simulation results show that output power of four-photodiodes type T arrays is reduced by half and its cut-off frequency is doubled if compared to four-photodiodes traveling-wave photodetector arrays. The output power and the cut-off frequency are both doubled if compared to traditional photodetector. The output power of eight-photodiodes type T detector is the same as the output power of four-photodiodes TWDA,but its operation bandwidth is doubled.