US3945016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-band spiral antenna
Assignee: Thales SA
•
Filing: 1974-08-28
•
Granted: 1976-03-16
•
Expires: 1994-08-28
Abstract
Abstract The invention relates to wide-band, plane, spiral antennas. A conductive arm is arranged spirally in a plane close to a reflector. A resonator member positioned at the centre and in front of the spiral assists the area opposite which it is situated to radiate at high frequencies, to the detriment of the peripheral areas. An absorbent member whose thickness increases from the centre to the periphery increases this effect even further.
Inventors
- 👤 Alain Bizouard
- 👤 Jean Rannou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/06; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/26; H01Q9/27
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
A wide-band spiral antenna comprising a reflector, at least one conductive, spiral arm arranged in a plane near said reflector, and a resonator member positioned centrally and in front of said spiral arm for increasing radiation at high frequencies from an area in front of which said member is situated.
Claim 2
Dependent Claim
50 words
A wide-band spiral antenna comprising a reflector, at least one conductive, spiral arm arranged in a plane near said reflector, and a resonator member positioned centrally and in front of said spiral arm for increasing radiation at high frequencies from an area in front of which said member is situated.
Claim 3
Dependent Claim
77 words
A wide-band spiral antenna comprising a reflector, at least one conductive, spiral arm arranged in a plane near said reflector, a resonator member positioned centrally and in front of said spiral arm for increasing radiation at high frequencies from an area in front of which said member is situated, and an absorbent member positioned against and in front of said reflector, the thickness of said absorbent member increasing from the centre of the antenna to its periphery.
Claim 4
Dependent Claim
77 words
A wide-band spiral antenna comprising a reflector, at least one conductive, spiral arm arranged in a plane near said reflector, a resonator member positioned centrally and in front of said spiral arm for increasing radiation at high frequencies from an area in front of which said member is situated, and an absorbent member positioned against and in front of said reflector, the thickness of said absorbent member increasing from the centre of the antenna to its periphery.
Claim 5
Dependent Claim
36 words
An antenna according to claim 2, wherein a front face of said absorbent member defines a plane surface and said reflector is formed by a truncated cone the apex angle of which is of predetermined size.
Claim 6
Dependent Claim
15 words
An antenna according to claim 2, wherein the said resonator member is a metal disc.
Claim 7
Dependent Claim
15 words
An antenna according to claim 2, wherein the said resonator member is a metal ring.
Claim 8
Dependent Claim
15 words
An antenna according to claim 2, wherein the said resonator member is a dielectric cylinder.
Claim 9
Dependent Claim
44 words
An antenna according to claim 2, wherein the said resonator member is composed of a dielectric cylinder and a metal disc, which is applied to a face of said cylinder which is situated on the same side of said reflector as said spiral arm.
Claim 10
Dependent Claim
44 words
An antenna according to claim 2, wherein the said resonator member is composed of a dielectric cylinder and a metal ring which is applied to a face of said cylinder which is situated on the same side of said reflector as said spiral arm.
References Cited (Backward Citations)
US2919442A
Cited
US3745585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |