US3573840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small bulk helically wound antennae and method for making same
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1968-12-09
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Granted: 1971-04-06
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Expires: 1988-12-09
Abstract
Abstract Small bulk cylindrical or conical antennae made of a helically wound conductor with a free end and a grounded end. The coupling to a power supply or a load circuit is effected along a short length of said conductor near to and terminating on said ground plane, either by direct shunt coupling or by inductive coupling. The grounded end can be provided with a capacitive load. The antennae can be manufactured by sticking a metal strip to a dielectric sheet and rolling the latter to the desired shape, or by printing circuit technique and subsequent winding to said shape, in which they may be kept by clamping, glueing or any other method.
Inventors
- 👤 Roger L Gouillou
- 👤 Guy F Ringenbach
- 👤 Jacques H Delomini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:13
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/32; H01Q9/36; H01Q1/00; H01Q1/36; H01Q1/362; H01Q1/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
An antenna comprising a plurality of turns of a single conductor helically wound around a geometrical surface having a longitudinal axis, one end of said conductor being connected to a conductive ground plane and its other end being free, said antenna comprising means for coupling it to a load circuit and being characterized in that, lambda denoting the wave length in free space corresponding to the operating frequency and by l the overall length of the wound conductor measured along said conductor, lambda and l satisfy the relation: 0.3 lambda l 0.45 lambda said coupling means including a short length of auxiliary conductor parallel and very near to, but not in contact with, said part of the said antenna conductor and being coupled to said conductor along a part thereof close to and terminating on said ground place, the length of said part being equal to a very small fraction of said wavelength, the said length of auxiliary conductor having one end connected to the said ground plane and the said load circuit being connected between the said ground plane and the other end of said length of auxiliary conductor.
Claim 2
Dependent Claim
190 words
An antenna comprising a plurality of turns of a single conductor helically wound around a geometrical surface having a longitudinal axis, one end of said conductor being connected to a conductive ground plane and its other end being free, said antenna comprising means for coupling it to a load circuit and being characterized in that, lambda denoting the wave length in free space corresponding to the operating frequency and by l the overall length of the wound conductor measured along said conductor, lambda and l satisfy the relation: 0.3 lambda l 0.45 lambda said coupling means including a short length of auxiliary conductor parallel and very near to, but not in contact with, said part of the said antenna conductor and being coupled to said conductor along a part thereof close to and terminating on said ground place, the length of said part being equal to a very small fraction of said wavelength, the said length of auxiliary conductor having one end connected to the said ground plane and the said load circuit being connected between the said ground plane and the other end of said length of auxiliary conductor.
Claim 3
Dependent Claim
23 words
An antenna according to claim 1, wherein an adjustable capacitor is connected between one point on the conductor and the said ground plane.
Claim 4
Dependent Claim
35 words
An antenna according to claim 1, wherein the end of the conductor which is not connected to the ground plane is connected to a conducting element acting as a capacitive load with respect to ground.
Claim 5
Dependent Claim
22 words
An antenna according to claim 3, wherein the conducting element comprises linear conductors disposed along the circumference and radii of a circle.
Claim 6
Dependent Claim
16 words
An antenna according to claim 3, wherein the said element is a plane, metal conducting plate.
Claim 7
Dependent Claim
31 words
An antenna according to claim 3, wherein the said element comprises a number of plates in the shape of sectors of a circle, which can be rotated round a common axis.
Claim 8
Dependent Claim
31 words
An antenna according to claim 1, wherein said conductor consists of a thin metal strip which adheres to a flexible sheet of dielectric material rolled in the shape of said surface.
Claim 9
Dependent Claim
22 words
An antenna according to claim 7, wherein said conductor is a thin metal strip printed on the surface of said dielectric sheet.
Claim 10
Dependent Claim
21 words
An antenna according to claim 7, wherein, it comprises auxiliary matching elements held in position by immersion in a dielectric substance.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |