CST2013: Farfield Source

Simulation: Sources and Loads Field Source Farfield Source

Within this dialog, you may define a farfield source for the Integral Equation Solver or the Asymptotic Solver. The farfield source can be found in the navigation tree under Farfields/FFSource. Here the position and the orientation can be checked. It is recommended to enable the option "Show structure" in the Farfield Plot View - Tab.

Alignment frame

Specifies the alignment and positioning of the farfield source. The following types are available:

Position frame

Choose here the Position for the farfield source.

Start for the theta (z'-axis) frame

X / Y / Z: Here, you may set the origin for Theta. You may enter any numbers; the resulting vector will be normalized to 1.  See also: Farfield Plot – Axes.   The farfield source can be found in the navigation tree under Farfields/FFSource. Please check the here the orientation of the farfield source.

Start for phi (x'-axis) frame

X / Y / Z: Here, you may set the origin for Phi. You may enter any numbers; the resulting vector will be normalized to 1 and orthogonalized to the z’-axis. However, you have to make sure that it is not parallel to the vector set as z’-axis (origin for Theta).  See also: Farfield Plot – Axes. The farfield source can be found in the navigation tree under Farfields FFSource. Please check the here the orientation of the farfield source.

Source file frame

Select a file which contains the farfield information. Files can be created in the Farfield Plot – General dialog from any CST MICROWAVE STUDIO farfield calculation. For farfields from external tools please use the Farfield Source File Format to specify the input data.

Use relative path: Use this checkbox to toggle between relative and absolute path names for the import file.

Use local copy only: The farfield source file is copied once into the project folder. Hence changes of the originally imported file do not affect the defined farfield source.

Multipole coefficients frame

The standard farfield source uses the farfield approximation to evaluate the nearfield excitation. In addition, it is possible to use multipoles calculated from the farfield to obtain an improved nearfield reconstruction. As the success of this method crucially depends on the number of chosen multipoles, several options are available:

Calculate multipole coefficients: This option enables the calculation of the multiple coefficients.

Multipole calculation:

Defines the strategy used to determine the maximal degree of the multipole expansion. Three modes are available:

Maximal multipole degree: Sets a user defined degree of the multipole expansion to guide the calculation. Its effect depends on the specified calculation mode.

This calculation mode is activated automatically if the farfield source is defined by a multipole data file. Automatic and Autotruncation will then use the full set of multipoles.

OK

Accepts your settings and leaves the dialog box.

Apply

Stores the currently defined farfield source. The dialog box open remains open.

Preview

Shows a preview of the defined farfield source without applying the settings.

Cancel

Closes this dialog box without performing any further action.

Help

Shows this help text.