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Ultra-wideband miniaturized omnidirectional antennas via multi-mode three-dimensional (3-D) traveling-wave (TW)

  • US 8,497,808 B2
  • Filed: 04/08/2011
  • Issued: 07/30/2013
  • Est. Priority Date: 04/08/2011
  • Status: Active Grant
First Claim
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1. An omnidirectional antenna comprising:

  • a plurality of traveling-wave (TW) structures comprising at least one ultra-wideband low-profile two-dimensional (2-D) surface-mode TW structure, the plurality of TW structures being adjacent to each other, and wherein the surface-mode TW structure is excited in mode-0 and comprises a 2-D surface-mode TW radiator for omnidirectional radiation, the 2-D surface-mode TW structures being further configured to have a diameter less than λ

    L/2 and a thickness less than λ

    L/10, where λ

    L is the free-space wavelength at the lowest frequency of operation of the 2-D surface-mode TW structures;

    a frequency-selective coupler placed in between adjacent TW structures;

    a feed network, wherein the feed network excites the plurality of TW structures in mode-0; and

    a conducting ground surface, wherein the conducting ground surface is of a canonical shape, the conducting ground surface further being positioned at a bottom side of the antenna, and having a surface area covering at least the projection of the antenna.

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