Abstract: When the scanning angle augments in huge-size planar phased array antenna, the instantaneous bandwidth of the signals will be restricted. In order to conquer this restriction, real time delay in T/R channel is collocated. The influence of beam scanning to the realization of radar′s instantaneous bandwidth under such a circumstance is firstly introduced, and the principle of the real time delay solution is afterward illustrated. Meanwhile all sorts of real time delay solution methods and their strong or weak points are summarized. The wideband T/ R system principle is then presented based on frequency-shifting and phase-shifting in linear frequency modulation system, and the diagrams of upconvertion and downconvertion chains are unfolded, consequently the experiment and simulation results are disclosed, proving the validity of the method.