Systems and methods for improving sleep disordered breathing

A neuromodulation system comprising:

• an implantable stimulator comprising:
• a lead comprising a lead body and a plurality of electrodes disposed on the lead body, wherein, when the lead is implanted and fully deployed, the electrodes are positioned proximate a hypoglossal nerve, and
• a first antenna operatively coupled to the lead;
• a substrate configured to be positioned outside of a patient's body during use, wherein the substrate comprises a substrate layer and a second antenna, wherein the second antenna comprises a conductive metal trace forming a first loop enclosing a first area and a second loop enclosing a second area, wherein the first loop and the second loop are on a first face of the substrate layer, wherein the first and second areas do not overlap;
• and
• a control unit configured to excite the second antenna such that the second antenna produces an electromagnetic field for inducing electrical current in the first antenna to power the lead, wherein the electromagnetic field extends between the first loop and the second loop.