US3585531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically variable microstrip directional coupler deposited on ferrite substrate
Assignee: Westinghouse Electric Corp
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Filing: 1969-04-29
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Granted: 1971-06-15
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Expires: 1989-04-29
Abstract
Abstract Described is a novel variable coupling, directional coupler employing parallel microstrip transmission lines deposited on a substrate of ferrite material. Variable coupling is achieved by varying a magnetic field applied to the ferrite material normal to the direction of wave propagation along the microstrip transmission lines.
Inventors
- 👤 James E Degenford
- 👤 Gus Kern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:27
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A parallel-line directional coupler comprising a substrate of ferrite material having deposited on one surface thereof parallel microstrip transmission lines, the microstrip transmission lines extending parallel to each other for a distance equal to a quarter wavelength of the energy to be coupled, conductive material deposited on the other side of the substrate and forming a ground plane, means for applying a magnetic field across said ferrite material in a direction normal to the direction of the wave propagation through said microstrip transmission lines and through said ferrite substrate in the area of said parallel microstrip transmission lines whereby the effective permeability of the ferrite material is determined by the magnetic field as well as the degree of coupling between the parallel transmission lines, and means for varying said magnetic field to vary the coupling coefficient between the parallel microstrip transmission lines.
Claim 2
Dependent Claim
142 words
A parallel-line directional coupler comprising a substrate of ferrite material having deposited on one surface thereof parallel microstrip transmission lines, the microstrip transmission lines extending parallel to each other for a distance equal to a quarter wavelength of the energy to be coupled, conductive material deposited on the other side of the substrate and forming a ground plane, means for applying a magnetic field across said ferrite material in a direction normal to the direction of the wave propagation through said microstrip transmission lines and through said ferrite substrate in the area of said parallel microstrip transmission lines whereby the effective permeability of the ferrite material is determined by the magnetic field as well as the degree of coupling between the parallel transmission lines, and means for varying said magnetic field to vary the coupling coefficient between the parallel microstrip transmission lines.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |