A1 Card

This card defines a voltage source that is placed on a wire segment.

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 segment (A1) icon.



Figure 1. The A1 - Add a voltage source to a segment dialog .

Parameters:

New source
A new excitation is defined which replaces all previously defined excitations.
Add to sources
A new excitation is defined which is added to the previously defined excitations.
Select segment
When this item is selected, the Apply source to last segment with label field becomes active. The label of the segment to which the source must be applied is specified with this text box. If more than one segment has this label, the source is applied to the last segment with this label. Alternatively, one may select Set source position then the feed segment is determined by specifying the Cartesian coordinates in the Segment centre group. These values are in m and are scaled by the SF card if the SF card has Modify all dimension related values checked.
Reverse feed orientation
By default, the vector of the voltage lies in the direction from the start of the segment to its end (the direction in which it was created). When this option is checked, the vector of the voltage lies in the opposite direction. This is the direction of the current flow through the segment. The internal EMF (electromagnetic force) of the impressed voltage source is in the opposite direction.
Apply source to last segment with label
Label of the segment to which the source is applied. If more than one segment has the same label then source is applied to the last segment with this label.
Magnitude of source (V)
Magnitude of the voltage source in V.
Phase of source (degrees)
Phase of the voltage source in degrees.
X, Y, Z position
The position of the centre of the feed segment in Cartesian coordinates (only available if Set source position is selected.)
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.