Patent ID: 8170680

Claim:
A system comprising: an implantable telemetry circuit; an implantable multi-length antenna electrically connected to the implantable telemetry circuit and configured to wirelessly transfer information electromagnetically at a specified first operating frequency range when in a first medium and at a specified second operating frequency range when in a different second medium, the implantable multi-length antenna including: a first non-switchback segment; a first switchback, electrically connected to the first non-switchback segment, the first switchback comprising first and second switchback segments; and a second non-switchback segment electrically connected to the first switchback; wherein the implantable multi-length antenna is configured to appear electrically as a first electrical length when in the first medium and as a different second electrical length when in the second medium; wherein the second electrical length in the second medium is less than a physical length of the implantable multi-length antenna due at least in part to a capacitive coupling of the first switchback segment and the second switchback segment when in the second medium; and wherein the first operating frequency range is specified using the first electrical length and the second operating frequency range is specified using the second electrical length.