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Capacitively coupled compound loop antenna

  • US 9,431,708 B2
  • Filed: 11/05/2012
  • Issued: 08/30/2016
  • Est. Priority Date: 11/04/2011
  • Status: Active Grant
First Claim
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1. A compound loop antenna, comprising:

  • a magnetic loop located on a first plane and generating a magnetic field, the magnetic loop including a downstream portion and an upstream portion, the upstream portion connected to a feed, the downstream portion separated from the upstream portion by a capacitive gap that capacitively feeds the downstream portion of the magnetic loop and causes at least in part a first electric field orthogonal to the magnetic field to be emitted from the upstream portion;

    an electric field radiator located on the first plane, the electric field radiator coupled to the downstream portion of the magnetic loop at approximately a 90 electrical degrees location relative to the feed, a 270 electrical degrees location relative to the feed, or a reflective minimum point where a current flowing through the magnetic loop is at a reflective minimum and configured to emit a second electric field orthogonal to the magnetic field;

    a radiator feed coupled to the magnetic loop, wherein at least a first portion of the electric field radiator is separated from the radiator feed by a second capacitive gap that capacitively feeds at least the first portion of the electric field radiator; and

    an electrical return trace coupling the electric field radiator to the magnetic loop, wherein the electrical return trace is positioned on a second plane below the first plane.

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