Abstract: For the microstrip patch antenna array, the influences of feeding networks constructed by probes and microstrips on the back-scattered field are analyzed using finite-difference time domain(FDTD)method in this paper when the incident pulse is polarized in horizontal and vertical directions respectively.The time domain waveform and the corresponding spectrum of scattered field are given.It shows that the peak value and energy of scattered field of the microstrip antenna array can be reduced if the patches are fed by probes with end-loads individually.However, when the array is fed by an end-loaded network, the backscattered field of the array is in no significant difference with that of the array with the open-end feeding network.The reason is that the narrow band feeding network can allow only a little amount of energy involved in the spectrum of central frequency passing through the network and being absorbed at the end of the network, and the ratio of the absorbed energy and the whole energy involved in the incident pulse is very small, especially for the case of short pulse.