Patent ID: 7535377

Claim:
A system comprising: first and second tubular tool string components, each component having a shoulder at a first end and a second end, the first shoulder of the first component being coupled to the second shoulder of the second component through mating threads; first and second inductive coils comprising at least one turn of an electrical conductor lying within a U-shaped magnetically conductive, electrically insulating trough disposed within a groove formed in the first shoulder of the first component and another U-shaped magnetically conductive, electrically insulating through disposed within another groove formed in the second shoulder of the second component, respectively, the first coil being in magnetic communication with the second coil; wherein the first coil has more turns than the second coil; and wherein the ratio of the number of turns between the 1st and 2nd coils is selected to optimize the frequencies for the transmission of signals; and wherein the troughs are brought into proximity of each other when the ends of the components are joined together to perform communication between the coils.