Lens antenna having an improved dielectric lens for reducing disturbances caused by internally reflected waves
First Claim
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1. A lens antenna comprising:
- a conical horn; and
a plano convex lens attached to an aperture of said horn and collimating waves from said conical horn, said lens being a circular lens with a diameter r, said lens having a first planar surface at a first side which faces free space and a hyperboloid of revolution at a second side opposite the first side and being made of a dielectric material with relative permittivity ranging from 2 to 4.characterized in that said lens is provided with a cylindrical portion which has a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance, said cylindrical portion being concentric with said lens.
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Abstract
A lens antenna is disclosed which comprises a conical horn and a lens attached to an aperture of the horn. The lens has a first planar surface at a first side which faces free space and a hyperboloid of revolution at a second side opposite the first side and is made of a dielectric material with relative permittivity ranging from 2 to 4. The lens is provided with a cylindrical portion which has a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance. The cylindrical portion being concentric with the lens.
201 Citations
13 Claims
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1. A lens antenna comprising:
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a conical horn; and a plano convex lens attached to an aperture of said horn and collimating waves from said conical horn, said lens being a circular lens with a diameter r, said lens having a first planar surface at a first side which faces free space and a hyperboloid of revolution at a second side opposite the first side and being made of a dielectric material with relative permittivity ranging from 2 to 4. characterized in that said lens is provided with a cylindrical portion which has a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance, said cylindrical portion being concentric with said lens. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A lens antenna comprising:
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a conical horn; and a plano-convex lens attached to an aperture of said horn and collimating waves from said conical horn, said lens being a circular lens with a diameter r, said lens having a first planar surface at a first side which faces a free space and a hyperboloid of revolution at a second side opposite the first side and being made of a dielectric material with relative permittivity ranging from 2 to 4. characterized in that said lens is provided with a cylindrical portion protruding from the first planar surface, said cylindrical portion having a diameter of about r/3 and a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance of about 0.17 λ
0 where λ
0 is a wavelength of a center frequency of a frequency range used with said lens antenna, said cylindrical portion being concentric with said lens.
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8. A lens antenna comprising:
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a conical horn; and a plano-convex lens attached to an aperture of said horn and collimating waves from said conical horn, said lens being a circular lens with a diameter r, said lens having a first planar surface at a first side which faces a free space and a hyperboloid of revolution at a second side opposite the first side and being made of a dielectric material with relative permittivity ranging from 2 to 4. characterized in that said lens is provided with a cylindrical portion recessed from the first planar surface, said cylindrical portion having a diameter of about r/3 and a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance of about 0.17 λ
0 where λ
0 is a wavelength of a center frequency of a frequency range used with said lens antenna, said cylindrical portion being concentric with said lens.
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9. A lens antenna comprising:
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a conical horn; and a plano-convex lens attached to an aperture of said horn and collimating waves from said conical horn, said lens being a circular lens with a diameter r, said lens having a first planar surface at a first side which faces free space and a second side opposite the first side, characterized in that said lens is provided with a cylindrical portion which has a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance, said cylindrical portion being concentric with said lens. - View Dependent Claims (10, 11, 12, 13)
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Specification
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Current AssigneeNEC Corporation
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Original AssigneeNEC Corporation
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InventorsTanabe, Kosuke, Kuramoto, Akio
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Primary Examiner(s)Wong, Don
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Assistant Examiner(s)NGUYEN, KIMNHUNG T
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Application NumberUS08/866,031Time in Patent Office837 DaysField of Search343/911 R, 343/753, 343/786, 343/756, 343/909, 343/910US Class Current343/911.00RCPC Class CodesH01Q 15/08 formed of solid dielectric ...H01Q 19/08 for modifying the radiation...
