Resonant coupler systems and methods for implants

A method of making a planar inductive resonant coupler, the method comprising:

• providing one or more planar loop resonators forming one or more loops;
• selecting one or more dimensions of the one or more planar loop resonators that are sized to tune a coupler resonance in a gap that forms an inner perimeter of the one or more planar loop resonators;
• and
• configuring the one or more planar loop resonators to establish electric fields across the gap and are configured to be coupled to circuitry, to receive or to transmit electromagnetic energy to or from a surrounding environment, and to transmit the electromagnetic energy to the circuitry.

A method of locating a subcutaneous object comprising:

• providing a planar loop resonator comprising forming a single loop, wherein two or more dimensions of the planar loop resonator are sized to tune a coupler resonance in a gap that forms an inner perimeter of the planar loop resonator;
• and wherein the planar loop resonator is configured to establish electric fields across the gap and is configured to be coupled to circuitry, to receive or to transmit electromagnetic energy to or from a surrounding environment, and to transmit the electromagnetic energy to the circuitry;
• plotting a location for each of one or more resonant frequencies of the planar loop resonator with respect to a surface under which the subcutaneous object is expected to be located;
• and
• identifying a location of the subcutaneous object based on a specific resonant frequency of the planar loop resonator on the surface.