Compact PIFA antenna

  • US 10,218,227 B2
  • Filed: 05/07/2014
  • Issued: 02/26/2019
  • Est. Priority Date: 05/07/2014
  • Status: Active Grant
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First Claim
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1. A planar inverted-F antenna (PIFA), comprising:

  • a printed circuit board (PCB) formed of an electrically insulating material with a low electrical conductivity, the PCB having a top surface and a bottom surface, and a thickness defined by a shortest distance between the top surface and the bottom surface;

    an antenna element formed of an electrically conducting material with an electrical conductivity higher than that of the PCB, the antenna element disposed on the top surface of the PCB, the antenna element having a predetermined impedance bandwidth and a plurality of slots arranged to provide the antenna element with a surface area smaller than a surface area of an antenna element having the same impedance bandwidth but not having a plurality of slots, all other parameters relevant to the impedance bandwidth being equal;

    a ground element formed of an electrically conducting material with an electrical conductivity higher than that of the PCB, the ground element disposed on the bottom surface of the PCB and operatively coupled to the antenna element, the ground element having a continuous perimeter defining a central area at least a portion of which comprises a layer formed of the electrically conducting material, the layer having;

    (i) at least one internal opening, and (ii) at least one internal slot arranged to provide the ground element with a layer smaller than a layer of a ground element providing the same radiation efficiency but not having at least one internal slot and at least one internal opening, all other parameters relevant to the radiation efficiency being equal.

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