US3775773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for generating planar beams from a linear doppler line source employing a circular parallel-plate waveguide
Assignee: TDK Micronas GmbH
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Filing: 1972-07-17
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Granted: 1973-11-27
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Expires: 1992-07-17
Abstract
Abstract A circular parallel-plate wave guide converter applied to the array of a linear Doppler-scanned antenna or to the array of an electronic-scanned antenna, to convert either of those antenna systems, which normally radiate conical-coordinate beams, to a system which radiates planar-coordinate beams, in the former case coded as to angle of radiation as a function of frequency. In one form, the aperture of the plate system comprises a 180 degree horn formed by flaring the circular perimeters of the plates. In another form, the horn section is folded downward to provide illumination as an offset feed for a 180 degree (in azimuth) reflector surface which is circular and convex in azimuth and also concave outward in any vertical plane.
Inventors
- 👤 J Nemit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:33
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/38; G01S1/40; H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/13; H01Q3/00; H01Q3/24; H01Q3/245; H01Q3/26; H01Q3/2658
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
An antenna system for radiating planar beams coded as to angle of radiation by frequency as determined at a remote receiving station, comprising: a linear array of radiating elements disposed along a first spatial coordinate; a pair of spaced conductive plates of generally circular outline each lying in a plane parallel to a plane containing the line of said array along said first spatial coordinate, said plates being spaced to act as a waveguide; and means for locating said array between and substantially along a line parallel to a pair of parallel diameters of said plates, to provide excitation of the space between said plates as a waveguide, the open edges thereof forming a circular sector aperture, said radiation from said aperture providing said planar beams as compared to the conical coordinates inherent from use of said array alone.
Claim 2
Dependent Claim
139 words
An antenna system for radiating planar beams coded as to angle of radiation by frequency as determined at a remote receiving station, comprising: a linear array of radiating elements disposed along a first spatial coordinate; a pair of spaced conductive plates of generally circular outline each lying in a plane parallel to a plane containing the line of said array along said first spatial coordinate, said plates being spaced to act as a waveguide; and means for locating said array between and substantially along a line parallel to a pair of parallel diameters of said plates, to provide excitation of the space between said plates as a waveguide, the open edges thereof forming a circular sector aperture, said radiation from said aperture providing said planar beams as compared to the conical coordinates inherent from use of said array alone.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1 in which said circular sector is substantially 180*.
Claim 4
Dependent Claim
22 words
Apparatus according to claim 2 in which said parallel plates are flared to form a horn aperture extending around said circular sector.
Claim 5
Dependent Claim
43 words
Apparatus according to claim 3 in which said array comprises a plurality of substantially equally spaced, independently excitable radiating elements, an RF source and commutating means whereby said elements may be excited from said RF source in accordance with a predetermined commutation pattern.
Claim 6
Dependent Claim
47 words
Apparatus according to claim 3 in which said array comprises a plurality of spaced radiating elements fed from an azimuth distribution network, each through a discrete corresponding phase-shifting means to form a planar beam which is a function of the distributed phase-shift program among said phase-shifting means.
Claim 7
Dependent Claim
27 words
Apparatus according to claim 3 in which the planes of said plates are substantially horizontal, whereby said aperture is a cylindrical sector curved in the horizontal plane.
Claim 8
Dependent Claim
68 words
Apparatus according to claim 3 including a reflector having a shape which is convex outward in the azimuth plane and concave outward in all vertical planes intersecting said reflector, in which said plates are vertically displaced with respect to said reflector, and in which said plates are curved toward said reflector such that said horn aperture forms an offset 180 degree sectoral horn feed for illuminating said reflector.
Claim 9
Dependent Claim
43 words
Apparatus according to claim 6 in which the spacing of said plates is predetermined, in the unflared portion, for vertical polarization operation at a value less than one-half wavelength and at a value between one-half and one full wavelength for horizontal polarization operation.
Claim 10
Dependent Claim
43 words
Apparatus according to claim 7 in which the spacing of said plates is predetermined, in the unflared portion, for vertical polarization operation at a value less than 1/2 wavelength and at a value between one-half and one full wavelength for horizontal polarization operation.
Claim 11
Dependent Claim
43 words
Apparatus according to claim 3 in which the spacing of said plates is predetermined, in the unflared portion, for vertical polarization operation at a value less than 1/2 wavelength and at a value between one-half and one full wavelength for horizontal polarization operation.
References Cited (Backward Citations)
US2721263A
Cited
US2659005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |