Patent US2740229A successfully refreshed from Google Patents.
US3820116A
Expired / Lapsed
US
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Double reflector antenna with polarization rotating main reflector
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1973-04-04
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Granted: 1974-06-25
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Expires: 1993-04-04
Abstract
Abstract A double reflector antenna system has a polarization rotating main reflector which is symmetrical, a polarization dependent subreflector which is symmetrical, and a feeder arranged with its aperture between the main reflector and the subreflector to deliver energy to or receive energy from the subreflector, the aperture being in a plane perpendicular to the symmetry axis of the two reflectors and having an oval shape facing the subreflector.
Inventors
- 👤 E Carlsson
- 👤 O Dahlsjo
- 👤 G Karlsson
- 👤 K Pettersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:49
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q15/00; H01Q15/24; H01Q19/19; H01Q19/195
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A double reflector antenna system comprising a polarization rotating main reflector, a polarization dependent subreflector disposed opposite said main reflector, and a feeder means disposed adjacent said main reflector in such a way that signal energy from said feeder means is transmitted to said subreflector and reflected therefrom to said main reflector or external signal energy received by said main reflector is reflected therefrom and via a further reflection from said subreflector to said feeder means, said feeder means including a tubular aperture aimed at said subreflector and having a cross-section which is elliptical with a major axis orthogonal to the polarization direction of the energy reflected from said subreflector.
Claim 2
Dependent Claim
110 words
A double reflector antenna system comprising a polarization rotating main reflector, a polarization dependent subreflector disposed opposite said main reflector, and a feeder means disposed adjacent said main reflector in such a way that signal energy from said feeder means is transmitted to said subreflector and reflected therefrom to said main reflector or external signal energy received by said main reflector is reflected therefrom and via a further reflection from said subreflector to said feeder means, said feeder means including a tubular aperture aimed at said subreflector and having a cross-section which is elliptical with a major axis orthogonal to the polarization direction of the energy reflected from said subreflector.
Claim 3
Dependent Claim
75 words
Arrangement of a double reflector antenna comprising a polarization rotating main reflector which is symmetrical about a given axis, a polarization dependent subreflector facing said main reflector and being symmetrical about said given axis, and a feeder means having an aperture between said reflectors and disposed to deliver energy to or receive energy from said subreflector, said aperture being in a plane orthogonal to said given axis and having an oval cross-section in said plane.
Claim 4
Dependent Claim
75 words
Arrangement of a double reflector antenna comprising a polarization rotating main reflector which is symmetrical about a given axis, a polarization dependent subreflector facing said main reflector and being symmetrical about said given axis, and a feeder means having an aperture between said reflectors and disposed to deliver energy to or receive energy from said subreflector, said aperture being in a plane orthogonal to said given axis and having an oval cross-section in said plane.
Claim 5
Dependent Claim
32 words
Arrangement according to claim 2, characterized in that the apertuRe (20) has an elliptic form with the major axis perpendicular to the polarization direction of the energy reflected from the subreflector (12).
Claim 6
Dependent Claim
22 words
Arrangement according to claim 2, characterized in that the feeder is supplied with at least one wall (12) dividing the aperture (20).
Claim 7
Dependent Claim
19 words
Arrangement according to claim 4, characterized in that the wall (21) extends along the largest diameter of the aperture.
Claim 8
Dependent Claim
45 words
Arrangement according to claim 2, characterized in that the subreflector (12) consists of a grid reflector known per se, the feeder being so directed that the largest diameter of the aperture (20) is perpendicular to the direction of the grid wires of the subreflector (12).
Claim 9
Dependent Claim
62 words
Arrangement of a double reflector antenna with a polarization rotating reflector, a polarization dependent subreflector and a feeder arranged to deliver energy to or receive energy from said subreflector characterized in that said feeder has an aperture with an oval shape facing said subreflector with a wall extending along the largest diameter of the aperture for dividing the same into different regions.
Claim 10
Dependent Claim
62 words
Arrangement of a double reflector antenna with a polarization rotating reflector, a polarization dependent subreflector and a feeder arranged to deliver energy to or receive energy from said subreflector characterized in that said feeder has an aperture with an oval shape facing said subreflector with a wall extending along the largest diameter of the aperture for dividing the same into different regions.
Claim 11
Dependent Claim
28 words
The arrangement of claim 7 wherein said subreflector comprises a plurality of parallel grid wires which are disposed orthogonally with respect to the largest diameter in the aperture.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |