US3790942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio beacon with a rotating cardioid radiation pattern in particular for use in landing grounds of secondary importance
Assignee: Thales SA
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Filing: 1972-05-25
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Granted: 1974-02-05
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Expires: 1992-05-25
Abstract
Abstract A radio beacon which requires only a low power for its operation and in which maintenance is reduced to a minimum. The rotating lobe is produced by means of an antenna with three dipoles which, by switching, are successively fed in phase with the omnidirectional antenna and then successively, in phase opposition therewith, this giving six positions of the rotating cardioid diagram.
Inventors
- 👤 H Becavin
- 👤 M Ronsin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:10
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/24; H01Q3/242; G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
A radio beacon comprising first means for radiating a fixed lobe, and second means for radiating a rotating lobe forming with said fixed lobe a rotating cardioid radiation pattern, said second means including. an HF oscillator; n dipoles, n being an integer greater than 1, having the same centre of symmetry and regularly angularly spaced about said centre, said dipoles having respective input connections; and a switching device for, during each cycle corresponding to one revolution of said rotating lobe, successively supplying said n dipoles from said HF oscillator during the course of the first half cycle and then repeating the operation by reversing the input connections of each of the dipoles, during the second half cycle.
Claim 2
Dependent Claim
117 words
A radio beacon comprising first means for radiating a fixed lobe, and second means for radiating a rotating lobe forming with said fixed lobe a rotating cardioid radiation pattern, said second means including. an HF oscillator; n dipoles, n being an integer greater than 1, having the same centre of symmetry and regularly angularly spaced about said centre, said dipoles having respective input connections; and a switching device for, during each cycle corresponding to one revolution of said rotating lobe, successively supplying said n dipoles from said HF oscillator during the course of the first half cycle and then repeating the operation by reversing the input connections of each of the dipoles, during the second half cycle.
Claim 3
Dependent Claim
14 words
A radio beacon as claimed in claim 1, wherein n is equal to 3.
Claim 4
Dependent Claim
25 words
A radio beacon as claimed in claim 1, wherein said first means comprise two curved dipoles arranged on a circle and forming a constant-current loop.
Claim 5
Dependent Claim
180 words
A radio beacon as claimed in claim 1, wherein said n dipoles are centre-fed, each of them thus being split into a first and second half-dipole, the first three half-dipoles being adjacent and connected to one and the same point A through three diodes, the three second half-dipoles being connected to one and the same point B through three other diodes, said six diodes being referred to as dipole selector diodes; said points A and B being connected with one another on the one hand by a section of line which introduces a 180* phase-shift in the high frequency signal, and on the other hand by two other diodes, referred to as phase selection diodes, between which there terminates an HF feeder cable; said switching device comprising means for alternately driving the two phase selector diodes conductive for times of T/2, and means for successively driving the dipole selector diodes conductive, two diodes connected to one and the same dipole being simultaneously driven conductive for a duration of T/6, where T is the period of rotation of said rotating lobe.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |