Low impedance printed circuit radiating element
First Claim
1. An antenna comprising:
- a substrate of a dielectric material;
a conductive ground plane on one surface of said dielectric substrate;
a planar element comprising a geometrically symmetrical area of a conductive material on an opposite surface of said dielectric substrate, said area having a periphery describing a shape having at least first and second axes of symmetry, wherein said second axis of symmetry intersects said first axis of symmetry within the area of said element and said first axis and said second axis are orthogonal, said element having a first notch in the periphery of said element on one side of said first axis and a second notch in the periphery thereof on the opposite side of said first axis, said first and second notches being rectangular and disposed along said second axis symmetrically with respect to said first axis, said element further having third and fourth notches in the periphery thereof, said third and fourth notches being rectangular and disposed along said first axis symmetrically with respect to said second axis;
first means coupling a first transmission line to said element at a location on an edge of said first notch remote from said periphery and on said second axis; and
second means coupling a second transmission line to said element at a location on an edge of said third notch remote from said periphery and on said first axis.
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0 Petitions
Accused Products
Abstract
A printed circuit radiating element comprises a geometrically symmetric planar area of a conducting material separated from a ground plane by a dielectric medium. The driving point of the radiating element is at the base of a notch in one side thereof so that the driving impedance is reduced from that obtained when the element is driven at its edge. Symmetrically disposed on opposite sides of an axis of symmetry of the element along which the driving point lies are two notches which restore the electrical symmetry of the radiating element thereby to suppress higher order modes. The suppression of these higher order modes results in a radiation pattern with minimal cross-polarized energy in the principal planes and high port-to-port isolation which could not be achieved with an asymmetrical element. Two driving points may be employed with the radiating element to produce a dual linearly polarized antenna and a reactive combiner or hybrid may be employed to obtain circularly-polarized radiations. The shape of the radiating element may be square, rectangular or circular, for example, in accordance with the desired characteristics. A plurality of radiating elements may be interconnected via appropriate transmission paths to form an antenna array.
111 Citations
13 Claims
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1. An antenna comprising:
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a substrate of a dielectric material; a conductive ground plane on one surface of said dielectric substrate; a planar element comprising a geometrically symmetrical area of a conductive material on an opposite surface of said dielectric substrate, said area having a periphery describing a shape having at least first and second axes of symmetry, wherein said second axis of symmetry intersects said first axis of symmetry within the area of said element and said first axis and said second axis are orthogonal, said element having a first notch in the periphery of said element on one side of said first axis and a second notch in the periphery thereof on the opposite side of said first axis, said first and second notches being rectangular and disposed along said second axis symmetrically with respect to said first axis, said element further having third and fourth notches in the periphery thereof, said third and fourth notches being rectangular and disposed along said first axis symmetrically with respect to said second axis; first means coupling a first transmission line to said element at a location on an edge of said first notch remote from said periphery and on said second axis; and second means coupling a second transmission line to said element at a location on an edge of said third notch remote from said periphery and on said first axis. - View Dependent Claims (2)
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3. An antenna comprising:
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a conductive ground plane; a planar element of a conductive material separated from said ground plane by a dielectric medium, wherein the periphery of said element defines a geometrically symmetrical shape about first and second axes of symmetry, wherein said second axis of symmetry intersects said first axis of symmetry within the area of said element and said first axis and said second axis are orthogonal, said element having first and second rectangular notches in the periphery thereof symmetrically disposed with respect to both said first axis and said second axis of symmetry, said element further having third and fourth rectangular notches in the periphery thereof, said third and fourth notches being symmetrically disposed with respect to said first and second axes; first means for coupling signals at a location on said element on an edge of said first notch remote from said periphery, said location being on one of said first and second axes; and second means for coupling signals at a location on said element on an edge of said third notch remote from said periphery, said location being on the other of said first and second axes. - View Dependent Claims (4, 5, 6, 7)
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8. A printed circuit antenna element comprising:
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a dielectric substrate having a ground plane on one surface thereof; a rectangular conductive pattern on the opposite surface of said substrate, and having four rectangular notches symmetrically disposed along the periphery thereof with respect to two orthogonal axes of symmetry of said rectangular conductive pattern; and first and second transmission lines on said opposite surface of said substrate and respectively connected to said pattern within first and second ones of said notches at ends opposite the open ends thereof and along respective ones of said axes of symmetry, said first and second notches being located adjacent each other along the periphery of said pattern. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification