A2 Card

On the Source/Load tab, in the Sources on geometry group, click the  Voltage source icon. From the drop-down list, click the  Voltage on vertex (A2) icon.

Figure 1. The A2 - Add a voltage source to a node dialog.

Parameters:

New source

A new source is defined that replaces all previously defined sources.

Add to sources

A new source is defined that is added to the previously defined sources.

Select segment

When this item is selected, then the Segment label field becomes active. Here one specifies the label of the segment that shall be fed (placed at either the start or end point as determined by the corresponding check box). The source has to be located at a node, either between two segments, or between a segment and a triangle, ground plane or polygonal plate. Only one segment with this label should be declared. If there is more than one segment with this label then only one node will be fed.

Set source position

If this check box is activated, the feed node is determined by specifying its Cartesian coordinates in the Coordinates of node group. These values are in m and may be scaled by the SF card. The source orientation is always consistent with the basis function defined over this node (see the information below under Use default feed direction).

Source at start of segment

This option is only available when selecting the feed segment by label. If set, it indicates that the feed location is at the start of the wire segment with a matching label.

Source at end of segment

This option is only available when selecting the feed segment by label. If set, it indicates that the feed location is at the end of the wire segment with a matching label.

Use default feed direction

This option is only available when selecting the feed segment by label. If set, it indicates that the positive feed direction is consistent with the basis function setup. For wire/surface junctions (UTD plates, infinite planes with the BO ground, or meshed triangle surfaces), this direction is away from the wire onto the surface. For wire connections between two segments, this direction is from the segment with the lower index to the segment with the higher index.

Positive feed direction like wire segment orientation

This option is only available when selecting the feed segment by label. If set, then the positive feed direction is like the orientation of the wire segment with the specified label.

Negative feed direction like wire segment orientation

This option is only available when selecting the feed segment by label. If set, the positive feed direction is opposite to the orientation of the wire segment with the specified label.

Magnitude of source

Magnitude of the voltage source in V.

Phase of source

Phase of the voltage source in degrees.

Reference impedance (Ohm)

The reference impedance of the excitation is used for S-parameter calculations and is the reference impedance used for realised gain calculations. It is also the default reference impedance used to calculate and display the reflection coefficient in POSTFEKO. If this field is empty or 0 in an S-parameter calculation, the value specified at the SP card is used. For realised gain and reflection coefficient calculations, 50 Ohm will be assumed when the field is empty or 0.