Plotting the Near Field Spectrum

Near-field frequency spectra are obtained when a simulation is performed by specifying a list of frequencies or a frequency sweep. For each frequency, the near field is calculated at the points specified in the Near-Field panel of the Setup tab. Therefore, a fixed point in space must be selected to plot the near field versus frequency (the near field spectrum).

To plot the near E-field, near H-field, or power density spectrum, go to Results > Plot Near E-Field Spectrum, Results > Plot Near H-Field Spectrum, or Results > Plot Power Density Spectrum in the main menu. These commands display the Select Near-Field Point dialog box, where a fixed observation point can be selected (Fig. 1). The AN-XY Chart application will then show the frequency spectrum of the selected field (Fig. 2). The E and H field components can be plotted in amplitude, phase, real, and imaginary parts by choosing these options under Plot in the AN-XY Chart main menu.