High gain planar scanned antenna array
First Claim
Patent Images
1. An antenna comprising:
- an active element;
a plurality of passive elements spaced apart from and circumscribing said active element; and
a dielectric substrate surrounding said active element and said plurality of passive elements, wherein said dielectric substrate has a lower propagation constant than the propagation constant of air, such that the radio frequency wave emitted by said active element in the transmitting mode or received by said active element in the receiving mode is tilted toward the plane of the dielectric substrate due to the lower propagation constant.
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Abstract
An antenna array having a central active element and a plurality of passive elements surrounding the active element is disclosed. A dielectric substrate or other slow wave structure is disposed radially outwardly from the passive elements for slowing the radio frequency waves so as to increase the antenna directivity by reducing the amount of energy radiated in the elevation direction.
219 Citations
34 Claims
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1. An antenna comprising:
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an active element;
a plurality of passive elements spaced apart from and circumscribing said active element; and
a dielectric substrate surrounding said active element and said plurality of passive elements, wherein said dielectric substrate has a lower propagation constant than the propagation constant of air, such that the radio frequency wave emitted by said active element in the transmitting mode or received by said active element in the receiving mode is tilted toward the plane of the dielectric substrate due to the lower propagation constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An antenna comprising:
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an active element;
a plurality of directing parasitic elements spaced apart from and circumscribing said active element, wherein the length of the parasitic elements is tapered downwardly in a direction away from the active element; and
a plurality of passive elements spaced between said active element and said plurality of parasitic elements, and circumscribing the active element. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An antenna comprising:
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an active element;
a plurality of passive elements spaced apart from said active element; and
a structure in the shape of a ring including a central aperture, said structure oriented such that said plurality of passive elements are disposed within the central aperture, wherein said structure further includes a plurality of concentric mesas defining a plurality of concentric grooves there between. - View Dependent Claims (28, 29, 30, 31)
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32. An antenna comprising:
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an active element;
a ground plane proximate the base of said active element;
a plurality of vertical parasitic elements spaced apart from said active element;
a plurality of passive elements spaced between said active element and said plurality of parasitic elements;
a dielectric substrate; and
wherein one of said plurality of passive elements and at least one of said plurality of parasitic elements are disposed on said dielectric substrate, and wherein said dielectric substrate is vertically affixed to said ground plane, and wherein said at least one parasitic element vertically affixed to said dielectric substrate is shorted to said ground plane. - View Dependent Claims (33, 34)
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Specification