US3955201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar randome antenna with switchable R.F. transparency/reflectivity
Assignee: Individual
•
Filing: 1974-07-29
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Granted: 1976-05-04
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Expires: 1994-07-29
Abstract
Abstract Control of the directivity, reflectivity, transparency and tuning of R.F. antenna array is accomplished by building antenna with short dipole segments with a switch between each two segments. The elements are properly connected to exhibit these electrical characteristics by remotely controlling the closing and opening of selected switches. The means for controlling the switches is isolated from the R.F. working frequencies of the antenna.STATEMENT OF GOVERNMENT INTEREST
Inventors
- 👤 Lloyd R. Crump
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:54
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/425; H01Q3/00; H01Q3/44; H01Q3/46
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
An antenna system comprising: a plurality of antenna segments arranged in a predetermined configuration, the lengths and spacings between the elements being predetermined also; a plurality of switches, each connected between adjacent ends of at least two antenna segments, the normal condition of said switches being the open condition, said switches comprising light-responsive diodes; remotely controlled means comprising light-generating means for selecting and closing a predetermined number of switches, the selection of switches determining at least one of the following characteristics of the antenna- tuning, reflectivity, directivity, and transparency, said selecting and closing means being isolated from the R.F. working frequencies of the antenna system.
Claim 2
Dependent Claim
105 words
An antenna system comprising: a plurality of antenna segments arranged in a predetermined configuration, the lengths and spacings between the elements being predetermined also; a plurality of switches, each connected between adjacent ends of at least two antenna segments, the normal condition of said switches being the open condition, said switches comprising light-responsive diodes; remotely controlled means comprising light-generating means for selecting and closing a predetermined number of switches, the selection of switches determining at least one of the following characteristics of the antenna- tuning, reflectivity, directivity, and transparency, said selecting and closing means being isolated from the R.F. working frequencies of the antenna system.
Claim 3
Dependent Claim
100 words
A radar antenna comprising: a curved section of R.F. transparent material, said curved section covering up to 360° in extent; a plurality of grid segments carried by said transparent material and arranged in a predetermined configuration; a plurality of switches, each connected between adjacent ends of at least two grid segments, the normal condition of said switches being the open condition; and remotely controlled means for selecting and closing the switches within a predetermined area so that said area becomes a reflector of radar energy, said selecting and closing means being isolated from the R.F. working frequencies of the antenna.
Claim 4
Dependent Claim
100 words
A radar antenna comprising: a curved section of R.F. transparent material, said curved section covering up to 360° in extent; a plurality of grid segments carried by said transparent material and arranged in a predetermined configuration; a plurality of switches, each connected between adjacent ends of at least two grid segments, the normal condition of said switches being the open condition; and remotely controlled means for selecting and closing the switches within a predetermined area so that said area becomes a reflector of radar energy, said selecting and closing means being isolated from the R.F. working frequencies of the antenna.
Claim 5
Dependent Claim
16 words
A radar antenna as in claim 2, wherein said curved section is part of a radome.
Claim 6
Dependent Claim
28 words
A radar antenna as in claim 2, said switches comprising solid-state switches controllable by electric signals and said remotely controlled means comprising means for supplying said electric signals.
Claim 7
Dependent Claim
20 words
A radar antenna as in claim 2, said switches comprising light-responsive diodes and said remotely controlled means comprising light-generating means.
Claim 8
Dependent Claim
32 words
A radar antenna as in claim 2, wherein said means for selecting and closing switches is operable to select and close different groups of switches in sequence to scan the antenna beam.
Claim 9
Dependent Claim
17 words
A radar antenna as in claim 6, wherein the scanning angle covers a full 360° in azimuth.
References Cited (Backward Citations)
US1860123A
Cited
US2210666A
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US2703363A
Cited
US3392393A
Cited
US3276023A
Cited
US3623109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |