Patch antenna element and application thereof in a phased array antenna
First Claim
1. A patch antenna element comprising:
- a conductive ground plane having a cavity recessed therein and defining a cavity aperture,a radiating patch backed by the cavity and arranged in the cavity aperture, anda feed arrangement coupled to the radiating patch at a feed point located within the patch and operable to provide radio frequency energy thereto;
the patch antenna element being configured such that a dimension of the radiating patch along an E-plane defined as a plane perpendicular to the radiating patch and passing through a center of the patch and the feed point, is less than the dimension of the cavity aperture along the E-plane by a first predetermined value, said first predetermined value being selected such to provide an asymmetrical radiation pattern of said patch antenna element,wherein said feed point is located at a position apart by a predetermined distance from the center of the patch along the E-plane.
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Abstract
A method of suppressing grating lobes generated in a radiating pattern of a phased array antenna, and a patch antenna element for use in the phased array antenna are described. The phased array antenna is formed from a plurality of symmetrical patch antenna elements spaced apart at a predetermined distance from each other. Each patch antenna element is configured for producing an asymmetrical radiation pattern. The antenna element includes a conductive ground plane, a radiating patch backed by a cavity and arranged in cavity aperture, and a feed arrangement. The patch antenna element is configured such that a dimension of the radiating patch along the E-plane of the antenna element is less than the dimension of the cavity aperture by a first predetermined value selected to provide an asymmetrical radiation pattern of the patch antenna element. To provide a required degree of the asymmetry of said radiation pattern, a dimension of the radiating patch along the H-plane should be less than the dimension of the cavity aperture along said H-plane by a second predetermined value.
22 Citations
20 Claims
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1. A patch antenna element comprising:
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a conductive ground plane having a cavity recessed therein and defining a cavity aperture, a radiating patch backed by the cavity and arranged in the cavity aperture, and a feed arrangement coupled to the radiating patch at a feed point located within the patch and operable to provide radio frequency energy thereto; the patch antenna element being configured such that a dimension of the radiating patch along an E-plane defined as a plane perpendicular to the radiating patch and passing through a center of the patch and the feed point, is less than the dimension of the cavity aperture along the E-plane by a first predetermined value, said first predetermined value being selected such to provide an asymmetrical radiation pattern of said patch antenna element, wherein said feed point is located at a position apart by a predetermined distance from the center of the patch along the E-plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 19)
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14. A patch antenna element comprising:
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a conductive ground plane having a cavity recessed therein and defining a cavity aperture, a radiating patch backed by the cavity and arranged in the cavity aperture, and a feed arrangement coupled to the radiating patch at a feed point located within the patch and operable to provide radio frequency energy thereto; the patch antenna element being configured such that a dimension of the radiating patch along an E-plane defined as a plane perpendicular to the radiating patch and passing through a center of the patch and the feed point, is less than the dimension of the cavity aperture along the E-plane by a first predetermined value, said first predetermined value being selected such to provide an asymmetrical radiation pattern of said patch antenna element, wherein the gain of said predetermined asymmetrical radiation pattern decreases by less than 6 dB of its maximum value from boresight to a point 77°
from boresight in a selected direction.
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15. A phased array antenna comprising a plurality of patch antenna elements, each patch antenna element comprising:
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a conductive ground plane having a cavity recessed therein and defining a cavity aperture, a radiating patch backed by the cavity and arranged in the cavity aperture, and a feed arrangement coupled to the radiating patch at a feed point located within the patch and operable to provide radio frequency energy thereto; the patch antenna element being configured such that a dimension of the radiating patch along an E-plane defined as a plane perpendicular to the radiating patch and passing through a center of the patch and the feed point, is less than the dimension of the cavity aperture along the E-plane by a first predetermined value, said first predetermined value being selected such to provide an asymmetrical radiation pattern of said patch antenna element; said patch antenna elements being spaced apart at a predetermined distance from each other; and
a beam steering system configured for steering an energy beam produced by said phased array antenna. - View Dependent Claims (16, 17)
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- 18. A method of suppressing grating lobes generated in a radiating pattern of a phased array antenna, the method comprising forming the phased array antenna from a plurality of symmetrical antenna elements spaced apart at a predetermined distance from each other, each symmetrical antenna element producing an asymmetrical radiation pattern, the method thereby enabling to extend a scanning angle of a steered energy beam of said phased array antenna.
Specification