US3761845A
Expired / Lapsed
US
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Fabrication method and apparatus using ferrite for shifting phase of an electromagnetic wave
Assignee: Raytheon Co
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Filing: 1972-07-27
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Granted: 1973-09-25
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Expires: 1992-07-27
Abstract
Abstract The present invention relates to an apparatus and method of manufacture of a simple and inexpensive ferrite phase shifter. It is economical to have the ferrite bar with its concommitant longitudinal rectangular hole for the high dielectric constant insert to be fired in the desired shape but it is rather difficult to hold the high tolerance of flatness required to fit the precision waveguide housing normally used. The ''''as fired'''' ferrite bars are often slightly warped or have a slight twist and likewise the hole generally follows the distortions of the entire ferrite bar, i.e., the hole is not perfectly straight. From the electrical point of view, a slight warpage in the bar is not in itself detrimental. It is undesirable only because it cannot be accurately fitted to the waveguide housing. These and other problems are circumvented by wrapping a metallic foil around a composite structure comprised of the ferrite bar and side spacers of low dielectric constant to form the phase shifter.
Inventors
- 👤 J Ajioka
- 👤 W Barten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:07
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19; H01P1/195; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
317 words
A ferrite phase shifter adapted to connect to rectangular waveguide of predetermined height and width, said ferrite phase shifter cmprising a ferrite bar of predetermined dielectric constant having a rectangular cross-section with a fired-in rectangular hole disposed longitudinally therethrough, the width of said ferrite bar being equal to said predetermined height; first and second low dielectric spacer bars of the same rectangular cross-section disposed coextensively adjacent both broad sides of said ferrite bar thereby to form a composite bar with said first and second sapcer bars having a combined thickness equal to said predetermined width less the height of said ferrite bar; a sheet of metallic foil disposed completely around the entire length of said composite bar in close proximity thereto thereby to provide a foil wrapped composite bar, said sheet of metallic foil having ears at the extremities of said composite bar on the sides thereof in contact with said ferrite bar; first and second flanges disposed about opposite extremities of said foil wrapped composite bar with said ears folded back and conductively attached thereto; a first rigid flat bar extending between aid first and second flanges adjacent to and co-extensive with said first spacer bar of said foil wrapped composite bar; second and third rigid flat bars extending between said first and second flanges adjacent to and co-extensive with said second spacer bar of said foil wrapped composite bar, said second and third rigid flat bars having an intervening space along the central portion of said second spacer bar of said foil wrapped composite bar; and no less than one driver wire penetrating into and extending along said rectangular hole through said foil wrapped composite bar at first and second places along said central portion of said second spacer bar; and a dielectric material within said rectangular hole of said ferrite bar, said dielectric material having a dielectric constant greater than said predetermined dielectric constant.
Claim 2
Dependent Claim
317 words
A ferrite phase shifter adapted to connect to rectangular waveguide of predetermined height and width, said ferrite phase shifter cmprising a ferrite bar of predetermined dielectric constant having a rectangular cross-section with a fired-in rectangular hole disposed longitudinally therethrough, the width of said ferrite bar being equal to said predetermined height; first and second low dielectric spacer bars of the same rectangular cross-section disposed coextensively adjacent both broad sides of said ferrite bar thereby to form a composite bar with said first and second sapcer bars having a combined thickness equal to said predetermined width less the height of said ferrite bar; a sheet of metallic foil disposed completely around the entire length of said composite bar in close proximity thereto thereby to provide a foil wrapped composite bar, said sheet of metallic foil having ears at the extremities of said composite bar on the sides thereof in contact with said ferrite bar; first and second flanges disposed about opposite extremities of said foil wrapped composite bar with said ears folded back and conductively attached thereto; a first rigid flat bar extending between aid first and second flanges adjacent to and co-extensive with said first spacer bar of said foil wrapped composite bar; second and third rigid flat bars extending between said first and second flanges adjacent to and co-extensive with said second spacer bar of said foil wrapped composite bar, said second and third rigid flat bars having an intervening space along the central portion of said second spacer bar of said foil wrapped composite bar; and no less than one driver wire penetrating into and extending along said rectangular hole through said foil wrapped composite bar at first and second places along said central portion of said second spacer bar; and a dielectric material within said rectangular hole of said ferrite bar, said dielectric material having a dielectric constant greater than said predetermined dielectric constant.
Claim 3
Dependent Claim
40 words
The ferrite phase shifter as defined in claim 1 additionally including spring means extending between said first and second and between said first and third rigid flat bars for supporting said foil wrapped composite bar along the entire length thereof.
Claim 4
Independent Claim
203 words
The method of fabricating a ferrite phase shifter using a ferrite bar of rectangular cross-section having an ''''as-fired'''' longitudinal hole therethrough, said method including placing low dielectric spacer bars flush with both broad sides of said ferrite bar to form a composite bar, threading no less than one drive wire through one of said spacer bars along said longitudinal hole and out through one of said spacer bars, and wrapping a sheet of metallic foil around the entire length of said coMposite bar in close proximity thereto with said drive wires penetrating therethrough including providing a sheet of foil at least as long as said composite bar and of a width greater than the perimeter of the cross-section thereof, placing holes in said sheet of metallic foil in positions to accommodate said drive wires, supporting said sheet of foil and said composite bar with said drive wires disposed through corresponding holes therein, folding said sheet of foil up the sides of said composite bar, folding opposite sides of said sheet of foil over the top of said composite bar, and electrically connecting said opposite sides of said sheet of foil together while simultaneously holding said sheet of foil snug against said composite bar.
Claim 5
Independent Claim
203 words
The method of fabricating a ferrite phase shifter using a ferrite bar of rectangular cross-section having an ''''as-fired'''' longitudinal hole therethrough, said method including placing low dielectric spacer bars flush with both broad sides of said ferrite bar to form a composite bar, threading no less than one drive wire through one of said spacer bars along said longitudinal hole and out through one of said spacer bars, and wrapping a sheet of metallic foil around the entire length of said coMposite bar in close proximity thereto with said drive wires penetrating therethrough including providing a sheet of foil at least as long as said composite bar and of a width greater than the perimeter of the cross-section thereof, placing holes in said sheet of metallic foil in positions to accommodate said drive wires, supporting said sheet of foil and said composite bar with said drive wires disposed through corresponding holes therein, folding said sheet of foil up the sides of said composite bar, folding opposite sides of said sheet of foil over the top of said composite bar, and electrically connecting said opposite sides of said sheet of foil together while simultaneously holding said sheet of foil snug against said composite bar.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |