Patent EP0338123B1 successfully refreshed from Google Patents.
Patent US3916415A successfully refreshed from Google Patents.
US3916415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna scanning
Assignee: RCA Corp
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Filing: 1950-09-28
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Granted: 1975-10-28
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Expires: 1970-09-28
Abstract
Abstract 3. An antenna system comprising an entire antenna assembly for establishing a directive electromagnetic energy pattern, a first means for rotating said assembly in its entirety about one axis thereby to scan 360* about said axis at an angular rate, a second means for scanning repetitively about the same axis at the same angular rate sectors of said 360* scan but in the reverse direction of said first scan, and third means simultaneously to operate said first and second means, whereby said pattern scans in steps.
Inventors
- 👤 Richard W Howrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:59
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/12; H01Q3/14
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
119 words
In an antenna system for a moving target indicator radar system for intermittently transmitting exploratory pulses in a given directive electromagnetic energy pattern, a first means for scanning said pattern in one direction about an axis over a first sector at one angular rate, and a second means for scanning said same pattern in a reverse direction about the same said axis at the same angular rate repetitively over smaller sectors which are sub-sectors of the first larger sector, said first and second means being simultaneously operable during the transmission of each exploratory pulse, whereby said pattern is scanned in discrete steps and there is no effective angular motion of the pattern while the exploratory pulse is being transmitted.
Claim 2
Dependent Claim
119 words
In an antenna system for a moving target indicator radar system for intermittently transmitting exploratory pulses in a given directive electromagnetic energy pattern, a first means for scanning said pattern in one direction about an axis over a first sector at one angular rate, and a second means for scanning said same pattern in a reverse direction about the same said axis at the same angular rate repetitively over smaller sectors which are sub-sectors of the first larger sector, said first and second means being simultaneously operable during the transmission of each exploratory pulse, whereby said pattern is scanned in discrete steps and there is no effective angular motion of the pattern while the exploratory pulse is being transmitted.
Claim 3
Dependent Claim
17 words
The system claimed in claim 1 said first means comprising means to rotate said entire antenna assembly.
Claim 4
Dependent Claim
85 words
An antenna system comprising an entire antenna assembly for establishing a directive electromagnetic energy pattern, a first means for rotating said assembly in its entirety about one axis thereby to scan 360* about said axis at an angular rate, a second means for scanning repetitively about the same axis at the same angular rate sectors of said 360* scan but in the reverSe direction of said first scan, and third means simultaneously to operate said first and second means, whereby said pattern scans in steps.
Claim 5
Dependent Claim
85 words
An antenna system comprising an entire antenna assembly for establishing a directive electromagnetic energy pattern, a first means for rotating said assembly in its entirety about one axis thereby to scan 360* about said axis at an angular rate, a second means for scanning repetitively about the same axis at the same angular rate sectors of said 360* scan but in the reverSe direction of said first scan, and third means simultaneously to operate said first and second means, whereby said pattern scans in steps.
Claim 6
Dependent Claim
27 words
The system claimed in claim 3 said third means to operate said first and second means simultaneously including a gearing connecting the said first and second means.
Claim 7
Dependent Claim
96 words
An antenna system comprising an entire antenna assembly having a directive electromagnetic energy pattern and having a first movable element of said assembly for scanning said pattern over a sector about an axis, a second movable element of said assembly for scanning said pattern over a second sector which is a sub-sector of the first about the same axis, and means connecting said two elements and relating their motions with the second causing the pattern to scan in the reverse angular direction repetitively but at the same angular rate as the other, whereby said pattern step-scans.
Claim 8
Dependent Claim
96 words
An antenna system comprising an entire antenna assembly having a directive electromagnetic energy pattern and having a first movable element of said assembly for scanning said pattern over a sector about an axis, a second movable element of said assembly for scanning said pattern over a second sector which is a sub-sector of the first about the same axis, and means connecting said two elements and relating their motions with the second causing the pattern to scan in the reverse angular direction repetitively but at the same angular rate as the other, whereby said pattern step-scans.
Claim 9
Dependent Claim
14 words
The system claimed in claim 5, said first movable element being movable to oscillate.
Claim 10
Dependent Claim
21 words
The system claimed in claim 5, said first movable element being movable to oscillate and said second element being rotatably movable.
Claim 11
Dependent Claim
17 words
The system claimed in claim 5, the larger sector being an exact multiple of the other sector.
Claim 12
Dependent Claim
30 words
The system claimed in claim 5 the larger sector being an exact multiple of the other sector, the said antenna pattern having a width substantially equal to the scanning steps.
Claim 13
Dependent Claim
89 words
An antenna system comprising an antenna assembly having a directive electromagnetic energy pattern and having a movable element for repetitively scanning said pattern over a sector less than 360* about an axis, means to impart a rotating motion to the entire assembly for scanning said pattern about the same axis over 360* made up of less sectors, and means relating the two motions whereby the scanning caused by the element is in the reverse angular direction but at the same angular rate as that caused by said rotating motion.
Claim 14
Dependent Claim
89 words
An antenna system comprising an antenna assembly having a directive electromagnetic energy pattern and having a movable element for repetitively scanning said pattern over a sector less than 360* about an axis, means to impart a rotating motion to the entire assembly for scanning said pattern about the same axis over 360* made up of less sectors, and means relating the two motions whereby the scanning caused by the element is in the reverse angular direction but at the same angular rate as that caused by said rotating motion.
Claim 15
Dependent Claim
11 words
The system claimed in claim 9, said element being rotatably movable.
Claim 16
Dependent Claim
59 words
The system claimed in claim 10, said assembly having a radiator or receptor with a directive electromagnetic energy pattern, and said movable element comprising a rotatable metallic element surrounding said radiator or receptor and rotatable about it, said metallic element having resonant slots circumferentially spaced whereby the rotation of said metallic element causes an apparent scanning of the pattern.
Claim 17
Dependent Claim
28 words
The scanning system claimed in claim 12 said slots being one-half wavelength electrically in a direction normal to the electric vector of the polarization of the energy pattern.
Claim 18
Dependent Claim
25 words
The system claimed in claim 13 said slots being circumferentially aligned and sets of said slots being aligned in an axial direction of said element.
Claim 19
Dependent Claim
48 words
The antenna claimed in claim 10, comprising a radiator or receptor with said pattern, said movable element being a rotatable metallic element surrounding said radiator or receptor and rotatable about it, and having resonant slots circumferentially spaced whereby the rotation of said metallic element causes said repetitive scanning.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |