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US4135170A
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US
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Junction between two microwave transmission lines of different field structures
Assignee: Thales SA
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Filing: 1977-04-28
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Granted: 1979-01-16
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Expires: 1997-04-28
Abstract
Abstract A microstrip line, formed by a conductor strip on one side of a dielectric substrate and by a ground-plane layer on the other side thereof, is electrically coupled to another microwave-transmission line, formed by a slot in the ground-plane layer paralleling the strip, with the aid of a supplemental conductor element establishing a virtual short-circuit at an off-axial location on a portion of the strip overlapping the slot. The supplemental conductor element may be a wire, traversing the substrate, or a lateral extension of the strip defining an open-circuited quarter-wavelength line with the ground-plane layer.
Inventors
- 👤 Michel Baril
- 👤 Jacques Legendre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:18
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/08; H01P5/10; H01P5/1007
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
In an assembly for the propagation of microwaves, in combination: a dielectric substrate; a first transmission line of symmetrical field structure comprising first conductor means forming a strip on said substrate; a second transmission line of asymmetrical field structure comprising second conductor means on said substrate forming a slot paralleling said strip, said slot and said strip extending toward each other from opposite directions and having overlapping terminal portions; and supplemental conductor means on said substrate establishing a virtual short-circuit between said terminal portions, along lateral edges thereof, at least for microwaves propagated thereover.
Claim 2
Dependent Claim
94 words
In an assembly for the propagation of microwaves, in combination: a dielectric substrate; a first transmission line of symmetrical field structure comprising first conductor means forming a strip on said substrate; a second transmission line of asymmetrical field structure comprising second conductor means on said substrate forming a slot paralleling said strip, said slot and said strip extending toward each other from opposite directions and having overlapping terminal portions; and supplemental conductor means on said substrate establishing a virtual short-circuit between said terminal portions, along lateral edges thereof, at least for microwaves propagated thereover.
Claim 3
Dependent Claim
45 words
The combination defined in claim 1 wherein said substrate has two parallel major surfaces, said strip being disposed on one of said surfaces, said second conductor means being a ground-plane layer disposed on the other of said surfaces and common to both said transmission lines.
Claim 4
Dependent Claim
23 words
The combination defined in claim 2 wherein said supplemental conductor means comprises a wire conductively interconnecting said lateral edges and traversing said substrate.
Claim 5
Dependent Claim
36 words
The combination defined in claim 2 wherein said supplemental conductor means comprises a lateral extension of said strip forming with said ground-plane lagyer an open-circuited ancillary line of a quarter-wavelength at the frequency of said microwaves.
Claim 6
Dependent Claim
21 words
The combination defined in claim 4 wherein said lateral extension comprises a sector-shaped conductor layer with a vertex adjacent said strip.
Claim 7
Dependent Claim
20 words
The combination defined in claim 1 wherein said terminal portions overlap for a quarter-wavelength at the frequency of said microwaves.
Claim 8
Dependent Claim
19 words
The combination defined in claim 1 wherein said supplemental conductor means is connected to a corner of said strip.
Claim 9
Dependent Claim
137 words
In an assembly for the propagation of microwaves, in combination: a dielectric substrate having two parallel major surfaces; a first transmission line of symmetrical field structure comprising first conductor means forming a strip on one of said surfaces; a second transmission line of asymmetrical field structure comprising second conductor means forming a slot parallel to said strip on the other of said surfaces; and supplemental conductor means on said one of said surfaces extending laterally from said strip and forming with said second conductor means an open-circuited ancillary line of a quarter-wavelength at the frequency of microwaves propagated along said transmission lines, said ancillary line originating at a location in line with a lateral edge of said slot whereby a virtual short-circuit for said microwaves is formed at said location between said first and second transmission lines.
Claim 10
Dependent Claim
137 words
In an assembly for the propagation of microwaves, in combination: a dielectric substrate having two parallel major surfaces; a first transmission line of symmetrical field structure comprising first conductor means forming a strip on one of said surfaces; a second transmission line of asymmetrical field structure comprising second conductor means forming a slot parallel to said strip on the other of said surfaces; and supplemental conductor means on said one of said surfaces extending laterally from said strip and forming with said second conductor means an open-circuited ancillary line of a quarter-wavelength at the frequency of microwaves propagated along said transmission lines, said ancillary line originating at a location in line with a lateral edge of said slot whereby a virtual short-circuit for said microwaves is formed at said location between said first and second transmission lines.
Claim 11
Dependent Claim
21 words
The combination defined in claim 8 wherein said supplemental conductor means comprises a sector-shaped layer with a vertex at said location.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |