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Multilevel and space-filling ground-planes for miniature and multiband antennas

  • US 7,688,276 B2
  • Filed: 02/19/2008
  • Issued: 03/30/2010
  • Est. Priority Date: 09/13/2001
  • Status: Expired due to Term
First Claim
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1. A handheld wireless device comprising:

  • an antenna element; and

    a ground plane comprising;

    a first conducting surface and a second conducting surface, each of the first conducting surface and the second conducting surface having a plurality of sides defined by at least one edge; and

    a conducting strip, the conducting strip connecting the first conducting surface and the second conducting surface and allowing current to flow between the first conducting surface and the second conducting surface;

    wherein the conducting strip is narrower than a width of the first conducting surface and a width of the second conducting surface;

    wherein the conducting strip is shaped as a curve comprising a plurality of connected segments;

    wherein each segment of the plurality of connected segments is shorter than a tenth of an operating free-space wavelength of the antenna element; and

    wherein the plurality of connected segments are spatially arranged so that no two adjacent and connected segments form a longer straight segment.

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