CST2013: Plane Wave

Simulation: Sources and Loads Plane Wave

Within this dialog, you may define a plane wave excitation source. Unlike discrete ports or waveguide ports, no S-parameters will be calculated. Instead, the stimulation amplitude (unit is V/m) is recorded. To obtain further information, you might specify probes or different types of field monitors. Combined with farfield monitors, the plane wave source can be used to compute the radar cross section (RCS).

Polarization frame

Here, you may enter the polarization of the plane wave and polarization specific settings. For more information on the different polarization types, please see the Plane Wave Overview.

Linear / Circular / Elliptical: Select here the type of plane wave excitation polarization.

Ref. frequency: If the selected type is circular or elliptical, enter here the reference frequency for the plane wave excitation. This field only applies to elliptical and circular polarized plane wave excitations.

Phase Difference: Enter here the phase difference between the two excitation vectors for elliptical polarized plane waves. This field only applies to elliptical polarized plane wave excitations.

Left / Right: Select here between left circular polarized or right circular polarized plane wave excitation. These settings only apply to circular polarized plane wave excitations. The respective radio buttons are only visible if a circular polarization is selected.

Axial ratio: Defines the ratio between the  amplitudes of the two electric field vectors used for elliptical polarization. This field only applies to elliptical polarized plane wave excitations.

Propagation normal frame

X/Y/Z: Here you can specify the propagation vector by entering valid expressions for the X/Y/Z component.

Electric field vector frame

X/Y/Z: Specify the electric field vector components in V/m. The electric field vector must be orthogonal to the propagation normal. If this is not the case, the user is asked if the electric field vector components should be automatically orthogonalized.

Please note that the input signal of an excited plane wave is normalized due to the defined absolute value of the electric field vector.

For a circular polarization, the length of the electric field vector defines the amplitude of the signal. For an elliptical polarization, the length and the direction of the electric field vector define the length and direction of the major axis. The length of the minor axis is computed from the axial ratio given by the user.

Decoupling plane frame

If a structure contains metallic walls dividing the calculation domain into two separate parts, it is necessary to consider a decoupling plane in the plane wave calculation. Note that this decoupling plane needs to be aligned with the Cartesian coordinate axes (see also: Plane Wave Overview ).

Automatic detection: The selection of this checkbox will automatically detect possible metallic walls and consequently activate the corresponding decoupling plane. This detection procedure only recognizes a metallic plane with no discontinuities at the boundary of the calculation domain. If the decoupling plane is not found, you may specify a decoupling plane using the input fields below.

Use decoupling plane: This checkbox is only available if the automatic detection is deselected. Activate here a user-defined decoupling plane defined by the following input fields.

Position: Set the position of the decoupling plane with respect to the plane normal by entering a valid expression. If the metal plane has a finite thickness, specify the surface of reflection.

Plane normal: Select a normal direction for the decoupling plane. Decoupling planes need to be aligned with the coordinate axes, so you can choose among X, Y or Z.

OK

Accepts your settings and leaves the dialog box.

Cancel

Closes this dialog box without performing any further action.

Help

Shows this help text.

Plane Wave Overview, Reference Value and Normalization