</tr>
</table>
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=== Multi-Frequency or Wideband Simulation Data ===
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One of the primary advantages of the FDTD method is its ability to run wideband EM simulations. The frequency domain data are computed by transforming the time-domain data to the Fourier domain. This is done automatically when EM.Tempo computes the port characteristics such as S/Z/Y parameters. The following frequency-domain observables are defined at a single frequency:
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* Near-Field Sensor
* Far-field Radiation Pattern
* RCS
* Huygens Surface
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The default computation frequency of the above observables is the project's center frequency (fc). You can change the observable frequency from the observable's property dialog and enter any frequency in Hz. The reason these types of simulation data are computed at a single frequency is their typically very large size. However, you can define as many instances of these observables and set different frequency values for each one. To facilitate the process of defining multi-frequency observables in EM.Tempo, you can use the following Python functions at the command line:
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emag_field_sensor_multi_freq(f1,f2,df,dir_coordinate,x0,y0,z0)
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emag_farfield_multi_freq(f1,f2,df,theta_incr,phi_incr)
== Generating the FDTD Mesh in EM.Tempo ==