Transmission line for drill pipes and downhole tools

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; and

a transmission medium disposed in the wired pipe segment between the first and second ends and providing at least part of an electrical path between the first and second couplers, the transmission medium comprising:

an assembly that includes an inner conductor surrounded over at least a portion of its length by an insulating material;

a plurality of separate, spaced-apart fixation elements surrounding and attached to the assembly at or near a single end of the assembly; and

a wire channel surrounding at least a portion of a length of the assembly and the fixation element, the wire channel being fixedly connected to the fixation element.

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

3. The wired pipe system of claim 1 , further comprising:

a connector disposed at least partially between the assembly and a communication coupler, the connector electrically connecting the communication coupler to the inner conductor.

4. The wired pipe system of claim 3 , wherein the connector is at least partially disposed within the wire channel.

5. 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.

6. The wired pipe system of claim 1 , wherein the fixation elements are glued to the assembly.

7. The wired pipe system of claim 1 , wherein the fixation elements are cold worked on to the assembly.

8. The wired pipe system of claim 1 , wherein the fixation elements are chemically or thermally bonded to the assembly.