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Microstrip antenna

  • US 3,987,455 A
  • Filed: 10/20/1975
  • Issued: 10/19/1976
  • Est. Priority Date: 10/20/1975
  • Status: Expired due to Term
First Claim
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1. A microstrip antenna for radiating or detecting electromagnetic signals having a wavelength λ

  • o comprising;

    a dielectric sheet of relative dielectric constant ε

    r, relative permeability μ

    r and uniform thickness t havinga. on a first broad surface1. at least three thin conductive resonant dipole radiator elements, each radiator element having two orthogonal coordinates that respectively define E and H planes of electromagnetic radiation for said radiator element, with the E plane coordinate dimension of each radiator element being approximately one-half the dielectric wavelength λ

    o/√

    ε

    r μ

    r ;

    2. said radiator elements conductively joined by thin conductive strips into an array or arrays of at least two radiator elements; and

    3. a terminal for connecting each array to a transmission line,b. on the other broad surface an essentially continuous thin conductive ground element more than coextensive with the radiator elements which defines a radiation aperture;

    wherein the improvement comprises;

    a. said conductive strips comprise one or more bridge elements, each bridge element having a length providing approximately a phase reversal from end to end at the operating wavelength λ

    o, each bridge element conductively joining two adjacent radiator elements in the same array at edges of approximately opposite phase, the width of each bridge element being less than the H coordinate dimension of one of the radiator elements it joins and less than one-half the H coordinate dimension of the other radiator element it joins, and in each array a bridge element is conductively joined to the periphery of a radiator element at a location that is opposite in phase to a location on said radiator element where said terminal or another bridge element is connected; and

    b. said terminal for connecting each array to a transmission line is located on a radiator element off the element'"'"'s H coordinate.

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