US3587099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sector radio beacon
Assignee: International Standard Electric Corp
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Filing: 1969-03-04
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Granted: 1971-06-22
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Expires: 1989-03-04
Abstract
Abstract To provide a rotating radiation pattern in a given sector, an antenna which radiates a carrier frequency F is flanked, substantially along a line, on one side by a directional antenna which radiates a frequency F- 15 Hz. and on the other side by a directional antenna radiating a frequency F+15 Hz. and a directional antenna radiating a frequency F+135 Hz. The directional antennas radiate in a direction substantially perpendicular to said line. The antenna spacing is dependent upon the carrier frequency and the desired width of said sector.
Inventors
- 👤 Ernst Kramar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:42
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/44; G01S1/46; G01S1/465
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A beacon for providing a rotating radiation field in a predetermined sector, comprising: an omnidirectional antenna for radiating a first carrier frequency; a first directional antenna located at a first distance from said omnidirectional antenna, which distance is determined by said first carrier frequency and the desired width of said sector, said first directional antenna radiating a second frequency higher than said carrier frequency by a predetermined difference; and a second directional antenna for radiating a third frequency located at a second distance from said omnidirectional antenna, said second distance equal to an integral multiple of said first distance, said third frequency being higher than said carrier frequency by an integral multiple of said predetermined difference, and said first and second directional antennas arranged substantially in a line with said omnidirectional antenna.
Claim 2
Dependent Claim
132 words
A beacon for providing a rotating radiation field in a predetermined sector, comprising: an omnidirectional antenna for radiating a first carrier frequency; a first directional antenna located at a first distance from said omnidirectional antenna, which distance is determined by said first carrier frequency and the desired width of said sector, said first directional antenna radiating a second frequency higher than said carrier frequency by a predetermined difference; and a second directional antenna for radiating a third frequency located at a second distance from said omnidirectional antenna, said second distance equal to an integral multiple of said first distance, said third frequency being higher than said carrier frequency by an integral multiple of said predetermined difference, and said first and second directional antennas arranged substantially in a line with said omnidirectional antenna.
Claim 3
Dependent Claim
32 words
A beacon, according to claim 1, further including means for radiating a fourth frequency located at a distance from said omnidirectional antennas which is a multiple, including one, of said first distance.
Claim 4
Dependent Claim
26 words
A beacon, according to claim 2, wherein said second and fourth frequencies are higher and lower respectively than said carrier frequency by a predetermined frequency difference.
Claim 5
Dependent Claim
14 words
A beacon, according to claim 2, wherein said means includes a third directional antenna.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |