Patent US2651503A successfully refreshed from Google Patents.
US4701765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure for a dichroic antenna
Assignee: Telecom Italia SpA
•
Filing: 1985-10-24
•
Granted: 1987-10-20
•
Expires: 2005-10-24
Abstract
Abstract This structure for a dichroic antenna can be used in a reflector antenna capable of operating at the same time at two different frequencies or with two orthogonal polarizations, and presents mechanical characteristics allowing its use on board the satellites. The structure, suitable for a subreflector, comprises a plurality of layers with high mechanical stiffness in the external part, followed by layers with low dielectric constant and one or a plurality of metallic grids in the most internal part, separated by low-dielectric constant layers.
Inventors
- 👤 Carlo Arduini
- 👤 Renato Barboni
- 👤 Antonio Castellani
- 👤 Ugo Ponzi
- 👤 Paolo Bielli
- 👤 Salvatore Contu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:46
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/0006; H01Q15/0013; H01Q15/0026; H01Q25/00; H01Q25/001; H01Q5/00; H01Q5/40; H01Q5/45
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A double reflecting antenna for use aboard satellites with a dichroic subreflector for a radiation, said radiation having first and second components, said first and said second components having at least one parameter selected from a group consisting of frequency and polarization said subreflector for reflecting said first of said components and transparent to said second of said components having a series of layers comprising: a first dielectric layer with high mechanical resistance; a second dielectric layer with low dielectric constant; a first grid for reflecting said first of said components and transparent to said second of said components; a third dielectric layer supporting said first grid; a fourth dielectric layer with low dielectric constant; a fifth dielectric layer with high mechanical resistance; a second grid; and a sixth dielectric layer for supporting said second grid.
Claim 2
Dependent Claim
136 words
A double reflecting antenna for use aboard satellites with a dichroic subreflector for a radiation, said radiation having first and second components, said first and said second components having at least one parameter selected from a group consisting of frequency and polarization said subreflector for reflecting said first of said components and transparent to said second of said components having a series of layers comprising: a first dielectric layer with high mechanical resistance; a second dielectric layer with low dielectric constant; a first grid for reflecting said first of said components and transparent to said second of said components; a third dielectric layer supporting said first grid; a fourth dielectric layer with low dielectric constant; a fifth dielectric layer with high mechanical resistance; a second grid; and a sixth dielectric layer for supporting said second grid.
Claim 3
Dependent Claim
144 words
A double reflecting antenna for use aboard satellites with a dichroic subreflector for a radiation, said radiation having first and second components, said first and said second components having at least one parameter selected from a group consisting of frequency and polarization, said subreflector for reflecting said first of said components and transparent to said second of said components having a series of layers comprising: a first dielectric layer with high mechanical resistance; a second dielectric layer with low dielectric constant; a first grid for reflecting said first of said components and transparent to said second of said components; a third dielectric layer supporting said first grid; a fourth dielectric layer with low dielectric constant; a second grid; a fifth dielectric layer for supporting said second grid; a sixth dielectric layer with low dielectric constant; and a seventh dielectric layer with high mechanical resistance.
Claim 4
Dependent Claim
144 words
A double reflecting antenna for use aboard satellites with a dichroic subreflector for a radiation, said radiation having first and second components, said first and said second components having at least one parameter selected from a group consisting of frequency and polarization, said subreflector for reflecting said first of said components and transparent to said second of said components having a series of layers comprising: a first dielectric layer with high mechanical resistance; a second dielectric layer with low dielectric constant; a first grid for reflecting said first of said components and transparent to said second of said components; a third dielectric layer supporting said first grid; a fourth dielectric layer with low dielectric constant; a second grid; a fifth dielectric layer for supporting said second grid; a sixth dielectric layer with low dielectric constant; and a seventh dielectric layer with high mechanical resistance.
Claim 5
Dependent Claim
23 words
A structure as defined in claim 2 wherein said first, said fourth and said sixth dielectric layers are fabricated with plastic foam rubber.
Claim 6
Dependent Claim
23 words
A structure as defined in claim 2 wherein said first, said fourth and said sixth dielectric layers are fabricated with cellular structure material.
References Cited (Backward Citations)
US3047860A
Cited
US3394378A
Cited
US4222054A
Cited
US4272770A
Cited
US4274098A
Cited
US4387377A
Cited
US4378561A
Cited
US4599623A
Cited
US4490723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |