L4 Card (Deprecated)

This card places a load between a metallic triangle and the ground plane for the planar multilayer Green’s function. No vertical current element is required, similar to the A4 card, saving resources.

On the Source/Load tab, in the Loads / networks group, click the Load icon. From the drop-down list, click the Coaxial load (L4) icon.

L4 Card	I₁ I/S	I₂ I/S	I₃ I/S	I₄ I/S	I₅ I/S	R₁ REAL	R₂ REAL	R₃ REAL	R₄ REAL	R₅ REAL	R₆ REAL	R₇ REAL	R₈ REAL
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Parameters:

Define a load at a coaxial attachment point: Define a load with the following parameters.
Remove all L4 type loads previously defined: This L4 card does not define a load, but rather all previously defined L4 loads are deleted. All the other input parameters of this card are ignored.
Load name: The name of the load.
Select element: The label of the triangle to load. If there is more than one triangle with this label, the one with the highest element number is loaded.
Set load position: Specify the Cartesian coordinates in the Select load coordinates group. The triangle with the centre point closest to this point is loaded.
Transform impedance to ground plane: The specified impedance refers to the metallic ground plane, and a transformation must be done to get the correct load impedance at the triangle.
Real part of the impedance: Real part of the load impedance in Ohm.
Imaginary part of the impedance: Imaginary part of the load impedance in Ohm.
Radius of the connection pin: The radius of the load pin in meters.

Parameters (INTERNAL):

I₁

-1: This L4 card does not define a load, but rather all previously defined L4 loads are deleted. All the other input parameters of this card are ignored.
0: Define a load with the following parameters.

I₂

The label of the triangle to load. If there is more than one triangle with this label, the one with the highest element number is loaded.

Alternatively, the user may set I₂=-1, and specify the Cartesian coordinates x = R₃, y = R₄ and z = R₅ of the load point. The triangle with the centre point closest to this point is loaded.

I₃

0: The specified impedance refers directly to the load point (centroid of the triangle).
1: The specified impedance refers to the metallic ground plane, and a transformation must be done to get the correct load impedance at the triangle.

R₁

Real part of the load impedance in Ohm.

R₂

Imaginary part of the load impedance in Ohm.

R₃

Only if I₂=-1: the X coordinate of the load position in meters

R₄

Only if I₂=-1: the Y coordinate of the load position in meters.

R₅

Only if I₂=-1: the Z coordinate of the load position in meters.

R₆

Only if I₃=-1: the radius of the load pin in meters.

The values R₃, R₄, R₅ and R₆ are scaled by the SF card if SKALFLAG=1.

The source coordinates (if entered) and the radius of the connection pin, if entered, are optionally scaled by the SF card.

If an L4 card is processed, any existing L4 load on that triangle is replaced. For example, if two L4 cards are used directly below each other, the first specifying a 50 $Ω$ and the second a 20 $Ω$ load, the segment will be loaded with 20 $Ω$ , not 70 $Ω$ .

It must also be noted that if the L4 card is used in conjunction with an A4 card (impressed current source), the load impedance of the L4 card is placed parallel to the input impedance of the A4 source (it has no effect if it is in series with the current source). The resulting input admittance is the sum of input admittance without the L4 load, and the admittance added by the L4 card.