Shielded Wire Pair -- Free Space
This configuration is applicable to shielded wire pairs
routed sufficiently far from conductive surfaces that they may be considered in
free space.
The term sep1-2 is the distance between
the center of wire 1 and the center of wire 2. The value of
sep1-2 must be greater than the sum of the radius of wire 1
and the radius of wire 2. The value of sep1-2 must be
less than the shield radius minus the radius of wire 1 minus the radius of wire
2.
The term sep1-shield is the distance in
meters between the center of wire 1 and the shield inner surface. The term
sep2-shield is the distance in meters between the center of
wire 2 and the shield inner surface. The value of
sep1-shield must be greater than the radius of wire 1, and the
value of and sep2-shield must be greater than the radius of
wire 2.
Angle θ is the angle in degrees between a line that
intersects the center of the shield and the center of the wire1, and a second
line that intersect the center of the shield and the center of wire 2. The
value for Angle θ must be in the range 0 to 180, inclusive, and must be
sufficiently large that wire 1 and wire 2 do not occupy the same space.
The shield diameter must be greater than the sum of wire 1
and wire 2 diameters.
Wire 1 is the upper conductor in the Main Screen diagram,
Wire 2 is the middle conductor, and Wire 3 is the lower conductor. Wire 3
is the ground conductor.
More:
 Shielded Wire Pair -- Ground Plane
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