Transmission line for wired pipe

1. A wired pipe system comprising:

a wired pipe segment having a first end and a second end;

a first coupler in the first end and a second coupler in the second end;

a transmission line disposed in the wired pipe segment between the first and second ends, the transmission line comprising:

an inner conductor; and

an insulating material surrounding the inner conductor; and

an outer conductor surrounding the insulating material and the inner conductor for at least a portion of a length of the transmission line, the outer conductor being formed by deforming around the inner conductor a sheet of material into a substantially tubular member, the outer conductor having a weld connecting one edge of the sheet of material to another edge of the sheet material and having an interference fit with the insulating material.

2. The wired pipe system of claim 1 , further comprising an external sleeve that surrounds an end of the outer conductor to provide a sealing cavity.

3. The wired pipe system of claim 1 , wherein the outer conductor extends beyond an end of at least one of the inner conductor and the insulating material.

4. The wired pipe system of claim 1 , further comprising a connector disposed at least partially between the insulating material and a communication coupler, the connector electrically coupling the coupler to the inner conductor.

5. The wired pipe system of claim 4 , wherein the connector is at least partially disposed within the outer conductor.

6. The wired pipe system of claim 5 , wherein a portion of the inner conductor extends beyond an end of the insulating material and is in electrical contact with the connector.

7. The wired pipe system of claim 4 , wherein a portion of the inner conductor extends beyond an end of the insulating material and is in electrical contact with the connector.