US3604009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Millimeter wave-scanning lens antenna
Assignee: Raytheon Co
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Filing: 1968-12-09
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Granted: 1971-09-07
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Expires: 1988-12-09
Abstract
Abstract The apparatus of the present invention provides a high-speed mechanical scanner that operates in the millimeter range of frequencies with a cylindrical quartz lens as a focusing device. A split annular waveguide with one half in constant rotation provides 355* of scan and presents angular information as a function of time. The disclosed electromechanical scanner generates a 3* beam with 16 db. sidelobes and may be scanned at a rate in excess of 10,000 angular degrees per second.
Inventors
- 👤 Marvin C Behnke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:31
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/12; H01Q3/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
An apparatus for scanning electromagnetic waves at high speed, said apparatus comprising a flat homogeneous dielectric cylinder, said dielectric cylinder having a focal point exterior to the cylindrical surface thereof and an axis of rotation; a first conductive plate of dimensions greater than those of said flat homogeneous cylinder attached to one side thereof, said first plate having a circular groove on the opposite side thereof from and at a radius greater than that of said flat cylinder for providing one-half an annular waveguide; a feed horn mounted on said first plate and coupled to said concentric groove, said feed horn being spaced at said focal point relative to the cylindrical surface of said flat dielectric cylinder; means attached to said first plate for rotating said feed horn and said flat dielectric cylinder about the axis of rotation thereof; a second conductive plate of dimensions greater than those of said circular groove in said first plate disposed adjacent to said first plate, said second plate having a circular groove directly opposite said circular groove in said first plate to provide the remaining half of said annular waveguide; and means coupled to said circular groove in said second plate thereby to provide a rotatable coupled to said feed horn.
Claim 2
Independent Claim
208 words
An apparatus for scanning electromagnetic waves at high speed, said apparatus comprising a flat homogeneous dielectric cylinder, said dielectric cylinder having a focal point exterior to the cylindrical surface thereof and an axis of rotation; a first conductive plate of dimensions greater than those of said flat homogeneous cylinder attached to one side thereof, said first plate having a circular groove on the opposite side thereof from and at a radius greater than that of said flat cylinder for providing one-half an annular waveguide; a feed horn mounted on said first plate and coupled to said concentric groove, said feed horn being spaced at said focal point relative to the cylindrical surface of said flat dielectric cylinder; means attached to said first plate for rotating said feed horn and said flat dielectric cylinder about the axis of rotation thereof; a second conductive plate of dimensions greater than those of said circular groove in said first plate disposed adjacent to said first plate, said second plate having a circular groove directly opposite said circular groove in said first plate to provide the remaining half of said annular waveguide; and means coupled to said circular groove in said second plate thereby to provide a rotatable coupled to said feed horn.
Claim 3
Independent Claim
205 words
An apparatus for scanning electromagnetic waves at high speed, said apparatus comprising a flat homogeneous cylinder of radius R and dielectric constant, K, less than 3.78; a first conductive disc of a radius greater than R attached concentrically to one side of said flat cylinder, said first disc having a circular groove disposed concentrically in the remaining side thereof for providing one-half an annular waveguide split through the broadside thereof; a feed horn mounted on said first disc opposite said flat cylinder and coupled to said concentric groove therein, said feed horn being spaced a distance R'' from the axis of rotation of said flat cylinder where R'' 0.76RK/(K-1); means attached to said first disc for rotating said feed horn and said flat cylinder about said axis of rotation thereof; a second conductive disc of a radius greater than that of said circular groove in said first disc concentrically disposed adjacent to said remaining side of said fist disc, said second disc having a circular groove directly opposite said circular groove in said first disc to provide the remaining half of said annular waveguide; and means coupled to said circular groove in said second disc thereby to provide a rotatable coupling to said feed horn.
Claim 4
Independent Claim
205 words
An apparatus for scanning electromagnetic waves at high speed, said apparatus comprising a flat homogeneous cylinder of radius R and dielectric constant, K, less than 3.78; a first conductive disc of a radius greater than R attached concentrically to one side of said flat cylinder, said first disc having a circular groove disposed concentrically in the remaining side thereof for providing one-half an annular waveguide split through the broadside thereof; a feed horn mounted on said first disc opposite said flat cylinder and coupled to said concentric groove therein, said feed horn being spaced a distance R'' from the axis of rotation of said flat cylinder where R'' 0.76RK/(K-1); means attached to said first disc for rotating said feed horn and said flat cylinder about said axis of rotation thereof; a second conductive disc of a radius greater than that of said circular groove in said first disc concentrically disposed adjacent to said remaining side of said fist disc, said second disc having a circular groove directly opposite said circular groove in said first disc to provide the remaining half of said annular waveguide; and means coupled to said circular groove in said second disc thereby to provide a rotatable coupling to said feed horn.
Claim 5
Dependent Claim
35 words
The apparatus for scanning electromagnetic waves at high speed as defined in claim 2 additionally including first and second choke slots disposed on opposite sides of said annular waveguide, respectively, thereby to minimize radiation therefrom.
Claim 6
Dependent Claim
54 words
The apparatus for scanning electromagnetic waves at high speed as defined in claim 2 wherein said feed horn is coupled to said concentric groove in said first disc in a predetermined direction and said last-named means is coupled to said concentric groove in said second disc in a direction opposite to said predetermined direction.
Claim 7
Dependent Claim
109 words
A scanning device for electromagnetic waves at high speed, said device comprising a flat homogeneous quartz cylinder with a 1/4 -wavelength dielectric layer on the cylindrical suRface thereof, said quartz cylinder having an axis of rotation and a focal point exterior to said dielectric layer thereof; means for providing a feed horn at said focal point in fixed relation relative to said flat quartz cylinder; means coupled to said cylinder and feed horn for rotating said feed horn about said axis of rotation of said cylinder; and means coupled to said feed horn for transmitting and receiving electromagnetic wave energy therethrough concurrently with the rotation of said feed horn.
Claim 8
Dependent Claim
109 words
A scanning device for electromagnetic waves at high speed, said device comprising a flat homogeneous quartz cylinder with a 1/4 -wavelength dielectric layer on the cylindrical suRface thereof, said quartz cylinder having an axis of rotation and a focal point exterior to said dielectric layer thereof; means for providing a feed horn at said focal point in fixed relation relative to said flat quartz cylinder; means coupled to said cylinder and feed horn for rotating said feed horn about said axis of rotation of said cylinder; and means coupled to said feed horn for transmitting and receiving electromagnetic wave energy therethrough concurrently with the rotation of said feed horn.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |