Poynting's Vector Modelling for Cyclostationary Electromagnetic Emissions from PCB

Estimation of statistical characteristics for radiated electromagnetic emissions caused by a PCB can be implemented by statistical signal processing of time domain signals measured by a near-field scanning system. The relation between the source signal and the signals measured by the nearfield probe at each scanning point can be modelled by linear transformation of the source signal. In this paper a modeling procedure for a near-field to far-field propagator based on Jefimenko's equations is presented. The radial component of instantaneous power density represented by Poyting's vector was derived from the modelled electric and magnetic far fields components. The synchronized impulse responses can be used for computer aided prediction of the spatial-time evolution of the cyclostationary characteristics in the environment surrounding the PCB. The 2D periodic ACF of the far-field shows the cyclostationary properties similar to the properties of the initial random bit sequence.