Figure 1: [[PO Module]]'s Simulation Engine Settings dialog.
=== PO Sweep Simulations ===
You can run [[EM.Cube]]'s PO simulation engine in the sweep mode, whereby a parameter like frequency, plane wave incident angles or a user defined variable is varied over a specified range at predetermined samples. The output data are saved into data files for visualization and plotting. [[EM.Cube]]'s [[PO Module]] currently offers three types of sweep:
# Frequency Sweep
# Angular Sweep
# Parametric Sweep
To run a PO sweep, open the '''Simulation ''''''Run Dialog''' and select one of the above sweep types from the '''Simulation Mode''' dropdown list of this dialog. If you select either frequency or angular sweep, the '''Settings''' button located next to the simulation mode dropdown list becomes enabled. If you click this button, the Frequency Settings Dialog or Angle Settings Dialog opens up, respectively. In the frequency settings dialog, you can set the start and end frequencies as well as the number of frequency samples. The start and end frequency values are initially set based on the project's center frequency and bandwidth. During a frequency sweep, as the project's frequency changes, so does the wavelength. As a result, the mesh of the structure also changes at each frequency sample. The frequency settings dialog gives you three choices regarding the mesh of the project structure during a frequency sweep:
# Fix mesh at the highest frequency.
# Fix mesh at the center frequency.
# Re-mesh at each frequency.
You can run an angular sweep only if your project has a plane wave excitation. In this case, you have to define a plane wave source with the default settings. During an angular sweep, either the incident theta angle or incident phi angle is varied within the specified range. The other angle remains fixed at the value that is specified in the '''Plane Wave Dialog'''. You have to select either '''Theta''' or '''Phi''' as the '''Sweep Angle''' in the Angle Settings Dialog. You also need to set the start and end angles as well as the number of angle samples.
In a parametric sweep, one or more user defined [[variables]] are varied at the same time over their specified ranges. This creates a parametric space with the total number of samples equal to the product of the number of samples for each variable. The user defined [[variables]] are defined using [[EM.Cube]]'s '''[[Variables]] Dialog'''. For a description of [[EM.Cube]] [[variables]], please refer to the "Parametric Modeling, Sweep & [[Optimization]]" section of [[EM.Cube]] Manual or see the "Parametric Sweep" sections of the FDTD or [[Planar Module]] manuals.
[[File:po_phys52.png]] [[File:po_phys54.png]]
Figure 1: [[PO Module]]'s Frequency Settings and Angle Settings dialogs.
== Working with PO Simualtion Data ==
The 2-D radiation patterns in the XY, YZ and ZX plane cuts.
=== PO Sweep Simulations ===
You can run [[EM.Cube]]'s PO simulation engine in the sweep mode, whereby a parameter like frequency, plane wave incident angles or a user defined variable is varied over a specified range at predetermined samples. The output data are saved into data files for visualization and plotting. [[EM.Cube]]'s [[PO Module]] currently offers three types of sweep:
# Frequency Sweep
# Angular Sweep
# Parametric Sweep
To run a PO sweep, open the '''Simulation ''''''Run Dialog''' and select one of the above sweep types from the '''Simulation Mode''' dropdown list of this dialog. If you select either frequency or angular sweep, the '''Settings''' button located next to the simulation mode dropdown list becomes enabled. If you click this button, the Frequency Settings Dialog or Angle Settings Dialog opens up, respectively. In the frequency settings dialog, you can set the start and end frequencies as well as the number of frequency samples. The start and end frequency values are initially set based on the project's center frequency and bandwidth. During a frequency sweep, as the project's frequency changes, so does the wavelength. As a result, the mesh of the structure also changes at each frequency sample. The frequency settings dialog gives you three choices regarding the mesh of the project structure during a frequency sweep:
# Fix mesh at the highest frequency.
# Fix mesh at the center frequency.
# Re-mesh at each frequency.
You can run an angular sweep only if your project has a plane wave excitation. In this case, you have to define a plane wave source with the default settings. During an angular sweep, either the incident theta angle or incident phi angle is varied within the specified range. The other angle remains fixed at the value that is specified in the '''Plane Wave Dialog'''. You have to select either '''Theta''' or '''Phi''' as the '''Sweep Angle''' in the Angle Settings Dialog. You also need to set the start and end angles as well as the number of angle samples.
In a parametric sweep, one or more user defined [[variables]] are varied at the same time over their specified ranges. This creates a parametric space with the total number of samples equal to the product of the number of samples for each variable. The user defined [[variables]] are defined using [[EM.Cube]]'s '''[[Variables]] Dialog'''. For a description of [[EM.Cube]] [[variables]], please refer to the "Parametric Modeling, Sweep & [[Optimization]]" section of [[EM.Cube]] Manual or see the "Parametric Sweep" sections of the FDTD or [[Planar Module]] manuals.
[[File:po_phys52.png]] [[File:po_phys54.png]]
Figure 1: [[PO Module]]'s Frequency Settings and Angle Settings dialogs.
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