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Compact radiation structure for diversity antennas

  • US 9,735,473 B2
  • Filed: 09/17/2010
  • Issued: 08/15/2017
  • Est. Priority Date: 09/17/2010
  • Status: Active Grant
First Claim
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1. An antenna for diversity operation comprising:

  • a plurality of connected antennas each connected antenna having;

    a first antenna with length of a quarter of a wavelength at a first operating frequency;

    a second antenna with length of a quarter of a wavelength at a second operating frequency distinct from said first operating frequency, the second antenna sharing with said first antenna a segment of a conductor; and

    a common feed point connected to said first or said second antennas such that said first antenna and said second antenna resonate at said first and second operating frequencies respectively and at least two of said connected antennas configured to have substantially orthogonal polarizations;

    wherein the first antenna is a straight line having first and second ends and the second antenna is arranged with an open end partially encircling the first antenna; and

    wherein the plurality of connected antennas are formed on a substrate, the first antennas of each of the plurality of connected antennas being connected together at a common connection point at the respective first ends of the first antenna, the plurality of connected antennas so connected being symmetric relative to at least one symmetry axis and wherein the substrate is spaced from a common ground plane.

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