Planar Near Field Measurement System and Computer Simulation for UWB Radar Antenna

This article describes an UWB radar antenna planar near field (PNF) measurement system under construction. Unlike the conventional antenna or RCS time domain test system, the UWB radar signal instead of the carrier free short time pulse was used to excite the antenna, which can satisfy the need to measure SAR and other UWB radar antennas measurement. In order to validate the data analysis program, we use the FDTD analysis software to calculate the electrical field of MtimesN points in a fictitious plane at different times just like the actual PNF sampling in the time domain (TD). The calculated results can be considered the actual oscilloscope´s sampling output signal. Through time-frequency domain transform and FD near to far field transform, we get the almost same radiation pattern comparing to the FD measurement and simulation results