Patent US3649935A successfully refreshed from Google Patents.
US3649935A
Expired / Lapsed
US
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Active microwave irises and windows
Assignee: National Aeronautics and Space Administration
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Filing: 1970-08-18
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Granted: 1972-03-14
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Expires: 1990-08-18
Abstract
Abstract A waveguide thin film window or an iris fabricated from either a thin film or a conventional plate and mounted transverse to the flow of energy in a waveguide and electrically insulated from the waveguide. Diode switching means are provided for selectively disconnecting and connecting the window or iris to the walls of the waveguide.
Inventors
- 👤 Robert L Ramey
- 👤 Hugh S Landes
- 👤 Eugene A Manus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:40
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/10; H01P1/15; H01P1/20; H01P1/213; H03; H03C; H03C7/00; H03C7/02; H03C7/025; H03C7/027
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
An active microwave waveguide iris comprising: a microwave iris located inside a waveguide transverse to the flow of energy in the waveguide; means for attaching said iris to the wall of said waveguide and for electrically insulating the iris from the walls of the waveguide; first switching means connected between said iris and one side of said waveguide through said insulating means for disconnecting and connecting said iris to said one side of said waveguide; second switching means connecting between said iris and a second side of said waveguide through said insulating means for disconnecting the connecting said iris to said second side of said waveguide; and means for controlling said first and second switching means to selectively disconnect and connect said iris to said one and second sides of said waveguide.
Claim 2
Dependent Claim
132 words
An active microwave waveguide iris comprising: a microwave iris located inside a waveguide transverse to the flow of energy in the waveguide; means for attaching said iris to the wall of said waveguide and for electrically insulating the iris from the walls of the waveguide; first switching means connected between said iris and one side of said waveguide through said insulating means for disconnecting and connecting said iris to said one side of said waveguide; second switching means connecting between said iris and a second side of said waveguide through said insulating means for disconnecting the connecting said iris to said second side of said waveguide; and means for controlling said first and second switching means to selectively disconnect and connect said iris to said one and second sides of said waveguide.
Claim 3
Dependent Claim
19 words
An active microwave waveguide iris according to claim 1 wherein said iris is a thin film without an aperture.
Claim 4
Dependent Claim
19 words
An active microwave waveguide iris according to claim 1 wherein said iris is a thin film with an aperture.
Claim 5
Dependent Claim
20 words
An active microwave waveguide iris according to claim 1 wherein said iris is a conventional conducting plate with an aperture.
Claim 6
Dependent Claim
18 words
An active microwave waveguide iris according to claim 1 wherein said first and second switching means are diodes.
Claim 7
Dependent Claim
30 words
An active microwave waveguide iris according to claim 5 wherein said control means include means for selectively applying a controlled reverse bias and a controlled forward bias to said diodes.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |