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Space-filling miniature antennas

  • US 9,331,382 B2
  • Filed: 10/03/2013
  • Issued: 05/03/2016
  • Est. Priority Date: 01/19/2000
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a portable communication device; and

    an antenna entirely included within the portable communication device, the antenna being a monopole antenna comprising an antenna element, a ground plane and a matching network between the antenna element and an input connector or transmission line, wherein;

    the antenna element has a perimeter shaped as a multi-segment curve;

    the multi-segment curve comprises at least ten connected segments, each segment being shorter than one tenth of at least one operating free-space wavelength of the antenna, the segments being spatially arranged such that no two adjacent and connected segments form another longer segment and none of the segments intersect with another segment other than to form a closed loop;

    any portion of the multi-segment curve that is periodic is defined by a non-periodic curve that includes at least ten connected segments in which no two adjacent and connected segments define a longer segment; and

    the multi-segment curve has a box-counting dimension greater than one with the box-counting dimension computed as the slope of a substantially straight portion of a line in a log-log graph over at least an octave of scales on the horizontal axes of the log-log graph.

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