Shielded Wire Pair -- Ground Plane
This configuration is applicable to shielded wire pairs
routed near a ground plane.
Height is the distance in meters from the surface of the
ground plane to the center of the shield. Height must be greater than the
radius of the shield.
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 θ1 is the clockwise angle in degrees between a
vertical line that bisects the center of the shield and a line that intersects
the center of the shield and the center of the wire 1. Angle θ2 is the
clockwise angle in degrees between a vertical line that bisects the center of
the shield and a line that intersects the center of the shield and the center of
the wire 2. The values for Angle θ1 and Angle θ2 must be in the range -180
to 180.
For example, the case Angle θ1 = 90 and Angle θ2 = -90
defines a wire pair that are equal height above the ground plane. The case
Angle θ1 = 0 and Angle θ2 = 180 defines a wire pair where the wires are in
vertical alignment, with wire 1 closest to the ground plane.
The shield diameter must be greater than the sum of wire 1
and wire 2 diameters.
The value of sep1-shield must be greater
than the radius of wire 1. The value of and sep2-shield
must be greater than the radius of wire 2. The value of
sep1-2 must be greater than the sum of the wire 1 and the wire
2 radiuses.
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:
 Ground Plane
|
