Pulsed signals and wide bandwidth antennas are of increasing use for radar and communication applications, thus implying the necessity of characterizing an antenna over large bandwidths, i.e., for arbitrary time varying signal (time domain). Although more effective sampling field representations over canonical scanning surfaces have been developed for harmonic fields, only recently have a sampling representation for time varying fields been introduced. A new sampling series for time varying fields over a plane is presented for a plane-polar scanning geometry. The advantages and the effectiveness of the frequency domain sampling representation are shared by the time domain sampling series