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Inverted F antenna system and RFID device having same

  • US 9,317,798 B2
  • Filed: 06/25/2012
  • Issued: 04/19/2016
  • Est. Priority Date: 08/29/2007
  • Status: Active Grant
First Claim
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1. An RFID device, comprising:

  • a substrate;

    a first active portion of a first inverted F antenna extending along a topside of the substrate;

    a first feed electrically coupled to the first active portion;

    a second active portion of a second inverted F antenna extending along an underside of the substrate such that the first active portion of the first inverted F antenna and the second active portion of the second inverted F antenna lie along parallel but spaced apart planes, wherein the second active portion of the second inverted F antenna is arranged in an opposite orientation relative to an orientation of the first active portion of the first inverted F antenna, such that the second active portion is rotated about 180 degrees from the orientation of the first active portion relative to a central axis perpendicular to a face of the substrate;

    a second feed electrically coupled to the second active portion;

    a ground plane spaced from the active portions;

    an RFID controller coupled to the feeds; and

    a battery coupled to the RFID controller, wherein the battery is positioned between the active portions of the inverted F antennas and the ground plane, such that the active portions of the inverted F antennas are on a first side of the battery and the ground plane is on a second side of the battery that is opposite of the first side.

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