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Notch fed twin electric micro-strip dipole antennas

  • US 4,072,951 A
  • Filed: 11/10/1976
  • Issued: 02/07/1978
  • Est. Priority Date: 11/10/1976
  • Status: Expired due to Term
First Claim
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1. A notched fed twin electric microstrip dipole antenna structure, comprising:

  • a. a dielectric substrate;

    b. a twin pair of thin rectangular radiating elements disposed one each on opposite sides of said dielectric substrate which electrically separates the twin radiating elements;

    c. the radiating element on one side of said dielectric substrate being directly opposite to and the mirror image of the radiating element on the other side of said dielectric substrate;

    d. each of said twiin radiating elements being operable to be excited to radiate in a microstrip mode, and each of said twin radiating elements acting as a ground plane for the other;

    e. the broadside fields of each of the antenna twin radiating elements being excited in identical modes of oscillation, radiating independently of each other with respective fields on opposite sides of the dielectric substrate being 180°

    out of phase with one another;

    f. said twin radiating elements each having a feed point located along the centerline of the length thereof;

    said feed points being directly opposite to each other;

    g. said twin radiating elements each having a notch extending into the element along the centerline of the length from one end thereof to said feed point;

    h. the length of said twin radiating elements determining the resonant frequency of the antenna;

    i. the antenna input impedance being variable to match most practical impedances as said feed points are moved along the element centerline without affecting the antenna radiation pattern;

    j. the antenna bandwidth being variable with the width of the twin radiating elements and the spacing between said twin radiating elements, the width of the notch being a factor as to the effective width of said twin elements, said spacing between the twin radiating elements having somewhat greater effect on the bandwidth than the width of the elements.

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