A7 Card

This card specifies a voltage source on an edge between two triangles or at a connection between a single triangle and a PEC ground plane or UTD plate.

On the Source/Load tab, in the Sources on geometry group, click the  Archaic sources icon. From the drop-down list, click the  Voltage between triangles (A7) icon.

Note: The AE card is much simpler to use and is the recommended card to use for edge sources. (The A7 card is supported only for compatibility with Feko input files that were created before the AE card became available.)

Figure 1. The A7 - Add a voltage at an edge dialog.


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 triangle
If this item is selected, a triangle with label specified in the Element label (see manual) text box is searched for. The excitation is placed on the edge positioned opposite the first corner of the triangle. The label must be unique (if possible only one triangle must have this label). If there is more than one triangle with this label then only a single triangle will be fed. Alternatively, when selecting the option, Set source position, the feeding edge is determined by specifying its Cartesian coordinates in the Coordinates of edge centre group. These coordinates are in meters and optionally scaled by the SF card. The edge must be positioned between two triangles or between a triangle and a ground plane or UTD plate.
Magnitude of source (V)
Absolute value of the voltage source in V.
Phase of source (degrees)
Phase of the voltage source in degrees.
If two triangles are connected to the edge, the basis function between these triangles will be excited. The vector direction of the voltage source will be in the same direction as the basis function associated with this edge. This is the direction of the current flow through the edge. The internal EMF (electromagnetic force) of the impressed voltage source is in the opposite direction.

In selected special cases there may be only one triangle connected to the edge. If the edge is positioned in the plane of a polygonal plate or a PEC ground plane (specified with a GF or BO card), the excitation is placed on the appropriate basis function connecting the triangle to the plate/plane. The positive feed direction is then towards the edge.