Microstrip antenna
First Claim
1. A microstrip antenna for radiating or detecting electromagnetic signals having a wavelength λ
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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 ##EQU12##
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Accused Products
Abstract
Microstrip antenna having one or more arrays of resonant dipole radiator elements. The radiator elements have an E coordinate dimension of approximately ##EQU1## A feed line made up of similar, series-connected, semiresonant, approximately half-wave sections distributes energy to and provides the desired phase relationship between the radiator elements. The radiator elements are conductively joined to alternate sides of the feed line at successive junctions of the half-wave sections to provide an array, with the feed line being electrically coupled to each radiator element in the array along an edge of the radiator element that intersects its E coordinate. The H coordinates of the radiator elements lie generally along a straight line through the radiator elements of the array. The radiator elements and feed line sections are in a broad surface which is uniformly spaced from a ground element by a dielectric sheet.
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Citations
47 Claims
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1. A microstrip antenna for radiating or detecting electromagnetic signals having a wavelength λ
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comprising;a dielectric sheet of relative dielectric constant ε
r, relative permeability μ
r and uniform thickness t havinga. on a first broad surface 1. 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 ##EQU12## - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 29, 30, 33, 37, 41, 46)
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2. said radiator elements conductively joined by thin conductive strips into an array or arrays of at least three radiator elements;
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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 radiator aperture; wherein the improvement comprises; a. said conductive strips comprise at least one feed line consisting of similar, series-connected, semi-resonant, approximately half-wave sections, each feed line having a maximum width that is less than one-fourth the dielectric wavelength where the feed line sections extend between adjacent radiator elements; b. the radiator elements are conductively joined to alternate sides of each feed line at successive junctions of its half-wave sections to provide an array, the feed line being electrically coupled to each radiator element in said array along an edge of the radiator element which intersects its E coordinate; c. a terminal for connecting the array to a transmission line is located on a radiator element off that radiator element'"'"'s H coordinate or at the
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27. A microstrip antenna for radiating or detecting electromagnetic signals having a wavelength λ
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comprising;a dielectric sheet of relative dielectric constant ε
r, relative permeability μ
r and uniform thickness t havinga. on a first broad surface 1. 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 ##EQU13##
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28. 2. said radiator elements conductively joined by thin conductive strips into an array or arrays of at least three radiator elements;
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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 radiator aperture; wherein the improvement comprises; a. said conductive strips comprise at least one serpentine feed line consisting of similar, series-connected, semi-resonant, approximately half-wave sections, each serpentine feed line having a maximum width that is less than one-sixth the dielectric wavelength where the feed line sections extend between adjacent radiator elements; b. the radiator elements are conductively joined to alternate sides of each serpentine feed line at successive junctions of its half-wave sections to provide an array, the radiator elements in the array are arranged with their H coordinates extending generally along a straight line through the radiator elements of the array, the serpentine feed line being electrically coupled to each radiator element in said array along an edge of the radiator element which intersects its E coordinate; and c. a terminal for connecting the array to a transmission line is located on a radiator element off that radiator element'"'"'s H coordinate or at the junction of two said half-wave sections. - View Dependent Claims (31, 32, 34, 35, 36, 38, 39, 40, 42, 43, 44, 45, 47)
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Specification