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This paper describes an UWB RCS/antenna planar near field (PNF) measurement system under construction to get the wideband RCS or the impulse response and transient characteristic of UWB antenna. A metal plate's bistatic RCS measurement under TD-PNF was simulated and also was compared with the FD-PNF measurement result. The results show good agreement. Unlike the conventional antenna or RCS time domain test system, the UWB radar signal instead of the no-carrier short time pulse was used to excite the antenna that can avoid the decrease of the dynamic range. FDTD is used to calculate the transient E-field of MtimesN points in a fictitious plane just like the actual PNF sampling signals in the time domain (TD). The calculated results can be considered the actual oscilloscope's sampling output signals. Through time domain near to far field transform, we get the almost same radiation pattern comparing to the FD measurement and the software simulation results.