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Multiple band antenna

  • US 5,300,936 A
  • Filed: 09/30/1992
  • Issued: 04/05/1994
  • Est. Priority Date: 09/30/1992
  • Status: Expired due to Term
First Claim
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1. A multiple band antenna comprising:

  • an electrically conductive plate serving as a ground plane;

    a first planar electrically conductive radiator disposed parallel to said ground plane, and a first dielectric layer interposed between said first planar radiator and said ground plane;

    an elongated electrically conductive rod radiator extending through a central portion of said planar radiator and oriented normally to said planar radiator;

    means for insulating said rod radiator from said planar radiator;

    a loop radiator encircling said planar radiator and being electrically insulated from said planar radiator;

    a second planar electrically conductive radiator disposed parallel to said first planar radiator and being located on a side of said first planar radiator opposite said ground plane;

    a second dielectric layer interposed between said second planar radiator and said first planar radiator;

    a first transmission line extending through said ground plane and said first dielectric layer to couple with said first planar radiator for coupling a first electromagnetic signal from said first planar radiator upon reception of electromagnetic radiation by said antenna;

    a second transmission line extending through said ground plane and said first dielectric layer and said first planar radiator and said second dielectric layer to couple with said second planar radiator for coupling a second electromagnetic signal from said second planar radiator, said second planar radiator being smaller than said first planar radiator, and said second electromagnetic signal having a smaller wavelength than said first electromagnetic signal;

    wherein a diameter of said first planar radiator and of said loop radiator is less than or equal approximately to one-half of a wavelength of radiation to be received respectively by said first planar radiator and said loop radiator; and

    said rod radiator has an electrical length greater than a cross-sectional dimension of said loop radiator for reception of radiation having a longer wavelength than radiation for said first planar radiator and for said loop radiator.

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