Broad band half Vivaldi antennas and feed methods
First Claim
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1. A half Vivaldi antenna, comprising:
- a ground plane;
a single conductive plate supported in a spaced relationship to the ground plane, wherein the single conductive plate and the ground plane do not touch each other at any place, wherein the single conductive plate and the ground plane have a gap therebetween that is narrowest at a throat and increases along a first curved surface of the single conductive plate to a first distal tip;
an electrical feed end located at the throat, wherein the apparatus has a 50-ohm impedance and wherein a 50-ohm coaxial cable is fed directly at the feed end; and
a conductive support with a non-conductive base located at the feed end, further comprising a non-conductive support located at the distal end tip, wherein the non-conductive base isolates the conductive support from the ground plane, wherein the conductive support together with the non-conductive support fixedly place the first single conductive plate over the ground plane.
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Abstract
A single Vivaldi antenna plate (half Vivaldi antenna) over a ground plane can be used to achieve a 50-ohm impedance, or two or more single plates over a ground plane to achieve other impedances. Unbalanced 50-ohm transmission lines, e.g., coaxial cables, can be used to directly feed the antenna.
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Citations
16 Claims
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1. A half Vivaldi antenna, comprising:
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a ground plane; a single conductive plate supported in a spaced relationship to the ground plane, wherein the single conductive plate and the ground plane do not touch each other at any place, wherein the single conductive plate and the ground plane have a gap therebetween that is narrowest at a throat and increases along a first curved surface of the single conductive plate to a first distal tip; an electrical feed end located at the throat, wherein the apparatus has a 50-ohm impedance and wherein a 50-ohm coaxial cable is fed directly at the feed end; and a conductive support with a non-conductive base located at the feed end, further comprising a non-conductive support located at the distal end tip, wherein the non-conductive base isolates the conductive support from the ground plane, wherein the conductive support together with the non-conductive support fixedly place the first single conductive plate over the ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15)
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8. An apparatus, comprising:
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a ground plane; a first conductive plate supported in a spaced relationship to the ground plane, wherein the first conductive plate and the ground plane do not touch each other at any place, wherein the first conductive plate and the ground plane have a gap therebetween that is narrowest at a throat and increases along a first curved surface of the first conductive plate to a first distal tip; and a second conductive plate supported in a second spaced relationship to the ground plane, wherein the second conductive plate is electrically connected in parallel with the first conductive plate, wherein the second conductive plate is physically connected to the first conductive plate, wherein the second conductive plate and the ground plane do not touch each other at any place, wherein the second conductive plate and the ground plane have the same gap therebetween as between the first conductive plate and the ground plane, wherein the second conductive plate is narrowest at the first throat and increases along a second curved surface of the second conductive plate to a second distal tip.
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9. An apparatus, comprising:
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a ground plane; a first conductive plate supported in a spaced relationship to the ground plane, wherein the first conductive plate and the ground plane do not touch each other at any place, wherein the first conductive plate and the ground plane have a gap therebetween that is narrowest at a throat and increases along a first curved surface of the first conductive plate to a first distal tip; and at least one additional conductive plate supported in at least one additional respective spaced relationship to the ground plane, wherein the at least one additional conductive plate is electrically connected in parallel with the first conductive plate, wherein the at least one additional conductive plate is physically connected to the first conductive plate, wherein the at least one additional conductive plate and the ground plane do not touch each other at any place, wherein the at least one additional conductive plate and the ground plane have the same gap therebetween as between the first conductive plate and the ground plane, wherein the at least one additional conductive plate is narrowest at a respective at least one additional throat and increases along a respective at least one additional curved surface of the respective at least one additional conductive plate to a respective at least one additional distal tip. - View Dependent Claims (10, 11, 12, 13, 14)
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16. An apparatus, comprising:
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a ground plane; a first conductive plate supported in a spaced relationship to the ground plane, wherein the first conductive plate and the ground plane do not touch each other at any place, wherein the first conductive plate and the ground plane have a gap therebetween that is narrowest at a throat and increases along a first curved surface of the first conductive plate to a first distal tip; and one or more reflector elements positioned behind the throat relative to the distal tip, wherein the one or more reflector elements are selected from a plurality of conductive rods of various lengths, each slightly longer than half the wavelength of a respective frequency of operation of the apparatus.
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Specification