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Offset FED magnetic microstrip dipole antenna

  • US 4,078,237 A
  • Filed: 11/10/1976
  • Issued: 03/07/1978
  • Est. Priority Date: 11/10/1976
  • Status: Expired due to Term
First Claim
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1. An offset fed magnetic microstrip dipole antenna having low physical profile and conformal arraying capability, comprising:

  • a. a thin ground plane conductor;

    b. a thin substantially rectangular radiating element spaced from said ground plane;

    c. said radiating element being electrically separated from said ground plane by a dielectric substrate;

    d. said radiating element being shorted to the ground plane at one end of the length thereof;

    e. said radiating element having a feed point located along an edge of the length thereof;

    f. the length and width of said radiating element and the spacing between the radiating element and the ground plane all being factors determining the resonant frequency of said antenna;

    g. the antenna input impedance being variable to match most practical impedances as said feed point is moved along said edge of the length of said radiating element without affecting the antenna radiation pattern;

    h. the antenna bandwidth being variable with the width of the radiating element and the spacing between said radiating element and said ground plane, and spacing between the radiating element and the ground plane having somewhat greater effect on the bandwidth than the radiating element width;

    i. said radiating element oscillating in five oscillating dipole moments, one at each of the four edges of said radiating element and one above the broadside surface of the radiating element, the oscillation along the four edges of the radiating element occurring between the radiating element and the ground plane and the oscillation above the broadside surface of the radiating element occurring along the length of the radiating element, there being only one current oscillation of the cavity between the radiating element and ground plane and said current oscillation mode contributes to the five oscillating dipole moments;

    j. optimum match for the resonant mode of oscillation being obtained by varying the location of said feed point along the radiating element edge.

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