Although EMA3D operates in the time domain, full frequency domain information can be easily obtained from a time domain EMA3D simulation as illustrated by the example below.

An Example of Obtaining Frequency Domain Information from Time Domain Results

For this example, it is desired to determine the transfer function between the induced wire current at a certain location in a wire harness in the automobile (designated in this model as "node 5733"), and a plane wave incident from the top and polarized parallel to the car’s axis of travel. The screen shot above shows the automibile model with the location of node 5733 indicated. The three plots below illustrate the process. The first plot is of the time domain Gaussian pulse used as the incident waveform. The next shows the wire current computed at node 5733 by EMA3D. The EMA3D post processing utilities are used to easily compute the transfer function between the two waveforms, plotted in dB A/(v/m)/Hz in the third plot shown. Broadband spectral information is obtained with one time domain simulation.

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