Radio frequency ring-shaped slot antenna
First Claim
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1. An array antenna comprising:
- a plurality of, N, antenna elements, adapted to produce a beam having a maximum angular deviation θ
from the boresight axes of the array, adjacent ones of such elements being separated a length less than a=(1-1/N)λ
H /(1+sinθ
) where λ
H is the wavelength of the highest operating frequency of the antenna, each one of such elements comprising;
a pair of substantially parallel electrically conducting plates in spaced-apart relationship at least two concentric apertures of substantially uniform width provided in one of the conductive plates, an outer one of such pair of apertures radiating radio frequency energy having the wavelength λ
H which is greater than the circumference of such outer radiating one of the pair of apertures.
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Abstract
An array antenna is disclosed wherein each one of the antenna elements includes at least two concentric slots formed in a conductive sheet. The conductive sheet is disposed on a dielectric support and a ground plane is found on the opposite surface of such support. The inner one of the slots enables the outer slot to radiate radio frequency energy having a wavelength greater than the circumference of such outer slot. When such antenna includes an additional concentric slot the antenna is adapted to operate over a pair of frequencies separated by greater than twenty percent while enabling the array antenna to have satisfactory grating lobe characteristics.
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Citations
2 Claims
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1. An array antenna comprising:
- a plurality of, N, antenna elements, adapted to produce a beam having a maximum angular deviation θ
from the boresight axes of the array, adjacent ones of such elements being separated a length less than a=(1-1/N)λ
H /(1+sinθ
) where λ
H is the wavelength of the highest operating frequency of the antenna, each one of such elements comprising;
a pair of substantially parallel electrically conducting plates in spaced-apart relationship at least two concentric apertures of substantially uniform width provided in one of the conductive plates, an outer one of such pair of apertures radiating radio frequency energy having the wavelength λ
H which is greater than the circumference of such outer radiating one of the pair of apertures. - View Dependent Claims (2)
- a plurality of, N, antenna elements, adapted to produce a beam having a maximum angular deviation θ
Specification
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Current AssigneeRaytheon Company (Rtx Corporation)
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Original AssigneeRaytheon Company (Rtx Corporation)
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InventorsMcOwen, Sherwood A. Jr.
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Primary Examiner(s)Lieberman, Eli
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Application NumberUS05/850,743Time in Patent Office949 DaysField of Search343/700 MS, 343/768, 343/769, 343/854, 343/789US Class Current343/769CPC Class CodesH01Q 13/106 Microstrip slot antennas pa...H01Q 13/18 the slot being backed by, o...H01Q 21/0075 Stripline fed arrays H01Q21...H01Q 21/064 using horn or slot aerials ...H01Q 21/24 Combinations of antenna uni...H01Q 5/28 Arrangements for establishi...H01Q 5/357 using a single feed pointH01Q 9/0435 using two feed points
