Modeling of Near-Field to Far-Field Propagator Based on the Jefimenko's Equations

Estimation of statistical characteristics for radiated electromagnetic emissions caused by PCB can be implemented by statistical signal processing of time domain signals measured by near-field scanning system. The relation between the source signal and the signals measured by the near-field probe at each scanning point can be modelled by an impulse response describing linear transformation of the source signal. In this paper modeling procedure for near-field to far-field propagator based on Jefimenko's equations is presented. Synchronized impulse responses can be used for computer aid prediction of the spatial-time evolution of the cyclostationary characteristics in the environment surrounding the PCB. Verification of the described measurement procedure was implemented by comparison of the calculated evolution of the electric field strength lines with the dipole radiation. The 2D periodic ACF of the far-field shows the cyclostationary properties similar to the properties of initial random bit sequence.