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Foreshortened antenna structures

  • US 4,814,783 A
  • Filed: 12/11/1987
  • Issued: 03/21/1989
  • Est. Priority Date: 11/09/1987
  • Status: Expired due to Term
First Claim
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1. A foreshortened dipole antenna structure for operating at frequencies at and above 300 MHz, said structure having a longitudinal axis and comprising:

  • two identical half-dipole sections with each section comprising;

    an elongated conductive stem portion disposed along said axis having two ends for connection at one end to an excitation potential, said stem portion having a width dimension D; and

    a conductive rectangular body portion having a width B where B>

    D, said body portion connected only at the midpoint of one edge to the other end of said stem portion and folded over said stem at said midpoint of one edge, said body portion disposed parallel to said axis and spaced slightly from said stem portion to be electrically insulated therefrom;

    each half-dipole section dipsosed along said axis, such that the excitation ends of said stems are spaced adjacent; and

    said dipole antenna having an overall length much less than λ

    /2 where λ

    is the wavelength of the resonant frequency of the dipole antenna.

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