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Omnidirectional broadband antennas

  • US 9,774,084 B2
  • Filed: 04/12/2016
  • Issued: 09/26/2017
  • Est. Priority Date: 11/07/2013
  • Status: Expired due to Fees
First Claim
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1. An omnidirectional broadband antenna comprising:

  • a ground element;

    an antenna element electrically isolated from the ground element, the antenna element having at least one portion that is substantially conical, that has a substantially hexagonal pyramidal shape, or that tapers in a longitudinal direction; and

    an annular patch element electrically grounded to the ground element, the annular patch element surrounding at least a portion of the antenna element and parasitically coupled to the antenna element;

    wherein the antenna is vertically polarized and operable at frequencies between about 380 MHz and about 6000 MHz with a voltage standing wave ratio (VSWR) less than or equal to about three to one (3;

    1), whereby the annular patch antenna element is configured to be operable as a λ

    /4 wave trap for an operating frequency band of 400 MHz to thereby broaden bandwidth.

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