A double cable shield consists of two shield layers. CADFEKO supports any combination of the shield types, solid,
braided and frequency-dependent for the inner and outer layer of the shield.
When creating a double cable shield, you need to specify the shield layer impedance
and admittance for the inner layer and outer layer of the shield. A gap size also needs
to be specified between the inner and outer layer of the double shield.
Note:
The total shield radius is the outer radius of the shield. The radius is used as
a common reference point between the inner and outer layer when stretching the
shield.
The stretching range is applicable when a braided (Kley, Vance, Tyni and
Demoulin) layer definition is used on the inner
layer or outer layer.
On the Cables tab, in the
Definitions group, click the Cable shield icon.
Under Shield layer(s), click
Double to create a double layered shield.
Under Shield layer(s), in the Gap between
layers field, enter a value for the gap between layers. The gap
should be greater than 0.
On the Inner layer tab, create a solid, braided or
frequency dependent shield layer.
On the Outer layer tab, create a solid, braided or
frequency dependent shield layer.
On the Advanced tab, under Stretching of the
shield, for the Optimisation methoddrop-down list, select Maximise optical
coverage, to automatically calculate the optimal weave angle and
optical coverage for maximum shielding for the braided inner or braided outer
layer.
The minimum and maximum radius of the double shield is indicated by the top
and bottom entry in the Total shield radius
column.
Note: For a double braided shield, the stretching of the shield is limited to
the stretching capability of both braided layers. The stretching range
(Total shield radius range) could be smaller for
a double braided shield than for a single braided shield, depending on the
braid parameters selected for each shield.
On the Advanced tab, under Stretching of the
shield, from the Optimisation methoddrop-down list, select Specify manually to
manually define values in the stretching table:
In the Total shield radius field, edit an
existing radius.
In the Inner layer or Outer
layerWeave angle column, enter a value for the weave angle
in degrees.
Note:
Total shield radius must be between the
minimum radius (first row, first cell) and maximum radius (last
row, first cell).
The values in the Inner layer Optical
coverage and Outer layer Optical
coverage columns, are calculated automatically
from the Total shield radius,
Inner layer Weave angle and
Outer layer Weave angle.
The Inner layer Weave angle or
Outer layer Weave angle values must
be between the minimum angle (first row, third cell) and maximum
angle (last row, fifth cell).
In the Label field, add a unique label for the double
cable shield.
Click Create to create the double cable shield and
close the dialog.