Patent US3575674A successfully refreshed from Google Patents.
US3575674A
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Microstrip iris directional coupler
Assignee: MA Com Inc
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Filing: 1969-05-09
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Granted: 1971-04-20
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Expires: 1989-05-09
Abstract
Abstract A microwave iris directional coupler on microstrip having high directivity is disclosed. The device is primarily for use in single ground plane microstrip transmission lines of the type commonly used for microwave hybrid integrated circuits. It has an iris between two lines separated by a common ground plane, such that each line forms a separate transmission line with the common ground plane and is completely isolated from each other, beyond the open portion of the iris.
Inventors
- 👤 Harlan Howe Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:57
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; H01P5/184; H01P5/187
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A microwave overlay directional coupler comprising an elongated primary electrical conductor having input and output ends, a secondary electrical conductor being elongated and disposed in vertically spaced longitudinal alignment with said primary electrical conductor, a common ground plane having an iris opening therein, said common ground plane being disposed in spaced relationship between said primary and secondary electrical conductors so that primary conductor, iris opening, and secondary conductor are in spaced longitudinal alignment, and a dielectric material of substantially higher dielectric constant than the surrounding air, said dielectric material separating said primary electrical conductor, said common ground plane with iris opening therein, and said secondary electrical conductor, said iris opening being substantially rectangular with its minor dImension larger than the width of said conductors, each of said conductors having a rectangular portion of similar dimensions to said iris opening in substantial registration with said opening.
Claim 2
Dependent Claim
145 words
A microwave overlay directional coupler comprising an elongated primary electrical conductor having input and output ends, a secondary electrical conductor being elongated and disposed in vertically spaced longitudinal alignment with said primary electrical conductor, a common ground plane having an iris opening therein, said common ground plane being disposed in spaced relationship between said primary and secondary electrical conductors so that primary conductor, iris opening, and secondary conductor are in spaced longitudinal alignment, and a dielectric material of substantially higher dielectric constant than the surrounding air, said dielectric material separating said primary electrical conductor, said common ground plane with iris opening therein, and said secondary electrical conductor, said iris opening being substantially rectangular with its minor dImension larger than the width of said conductors, each of said conductors having a rectangular portion of similar dimensions to said iris opening in substantial registration with said opening.
Claim 3
Dependent Claim
21 words
A microwave overlay directional coupler as recited in claim 1 wherein the dielectric material has a dielectric constant higher than 6.
Claim 4
Dependent Claim
41 words
A microwave overlay directional coupler as recited in claim 1 wherein the material of the primary and secondary electrical conductors, and the common ground plane are selected from the group consisting of aluminum, copper, molybdenum, nickel, gold, silver, columbium and niobium.
Claim 5
Dependent Claim
29 words
A directional coupler according to claim 1 in which the major dimension of said iris opening is a minor fraction of the length of either of said electrical conductors.
References Cited (Backward Citations)
GB828241A
Cited
US3513414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |