Abstract: An inductive coupler provides an interface between a power line and a communication device which communicates via the power line. The power line operates at a potential between four and 140 kilovolts while accommodating a current having a frequency between 45 and 65 hertz, and the communication device operates substantially at ground potential. The inductive coupler includes a split ferrite core having material selected to provide a substantially flat frequency response between one and 50 megahertz. The coupler also includes a clamping mechanism allowing the inductive coupler to clamp around the power line or around a utility line connected to the power line. Further, the coupler includes at least one lead for communicatively connecting the inductive coupler to the communication device. The inductive coupler forms an air gap when the inductive coupler is clamped. If the coupler is insulated, the insulation is also used for the air gap.

Abstract: A radio frequency (RF) signal coupler for cooperative engagement with a shunt device and for cooperative engagement with an RF modem. The shunt device has a high voltage terminal connected to an electrical cable of the power network and a low voltage terminal. The coupler comprises a signal lead connected to the low voltage terminal of the shunt device, a ground lead connected to earth ground, and a coupling transformer. The coupling transformer comprises a ferrite ring, a multiple turn primary winding having a first end and a second end, the first end being connected to the signal lead and the second end being connected to the ground lead, and a multiple turn secondary winding having two terminals for providing the RF signal to the RF modem. The ratio of turns of the secondary winding to the turns of the primary winding is at least two to one.