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Implantable multi-length RF antenna

  • US 8,170,680 B2
  • Filed: 03/03/2009
  • Issued: 05/01/2012
  • Est. Priority Date: 03/04/2008
  • Status: Active Grant
First Claim
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1. 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.

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