Patent US3911380A successfully refreshed from Google Patents.
US3911380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insertion phase trim method
Assignee: United States Department of the Navy
•
Filing: 1974-06-04
•
Granted: 1975-10-07
•
Expires: 1994-06-04
Abstract
Abstract The insertion phase of a ferrimagnetic phase-shifter is trimmed to a reference value by attaching permanent magnets to the outside of the waveguide to vary the flux linkages through the ferrimagnetic core. In one embodiment, rubber-magnet tape is applied to the outside top of the waveguide both to add flux linkages through the core and to compensate for any stray magnetic fields so as to give the trim the same effect in either direction of propagation along the waveguide. In a second embodiment, two permanent bar magnets are positioned uprightly on the waveguide above each end of the toroid core and a metallic bar is slidably placed across the top of the magnets. The metallic bar may be slid across the tops of the upright magnets varying the surface area contact between the bar and the magnets and thus varying the flux linkages running through the toroid core from the magnets. Varying the flux linkages varies the phase-shift of the toroid core.
Inventors
- 👤 Jr Louis J Lavedan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:00
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19; H01P1/195
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
A microwave ferrimagnetic phase-shifter comprising: waveguide means; ferrimagnetic toroid means contained and extending longitudinally within said waveguide means; first magnet means attached to the outside surface of one of the longitudinally extending walls of said waveguide means; second magnet means attached to the outside surface of the same waveguide wall upon which said first magnet means is attached, and placed such that a line connecting said first magnetic means to said second magnetic means would be parallel to the longitudinal axis of said waveguide means; longitudinally extending electrical conductor means providing a surface area at each longitudinal end, placed so that each end surface area contacts the top surface areas of said first and second magnetic means respectively such that said conductor means may be slid back and forth to vary the surface area contact between the conductor end surfaces and the top surfaces of the two magnetic means and thus vary the flux linkages through the path comprising the two magnet means, said conductor means, and said toroid means, thus varying the permeability of the toroid means and thus the phase shift of the phase-shifter.
Claim 2
Dependent Claim
186 words
A microwave ferrimagnetic phase-shifter comprising: waveguide means; ferrimagnetic toroid means contained and extending longitudinally within said waveguide means; first magnet means attached to the outside surface of one of the longitudinally extending walls of said waveguide means; second magnet means attached to the outside surface of the same waveguide wall upon which said first magnet means is attached, and placed such that a line connecting said first magnetic means to said second magnetic means would be parallel to the longitudinal axis of said waveguide means; longitudinally extending electrical conductor means providing a surface area at each longitudinal end, placed so that each end surface area contacts the top surface areas of said first and second magnetic means respectively such that said conductor means may be slid back and forth to vary the surface area contact between the conductor end surfaces and the top surfaces of the two magnetic means and thus vary the flux linkages through the path comprising the two magnet means, said conductor means, and said toroid means, thus varying the permeability of the toroid means and thus the phase shift of the phase-shifter.
Claim 3
Dependent Claim
29 words
A microwave ferrimagneteic phase-shifter as in claim 1, wherein said first and second magnet means are located on the waveguide wall, one above each end of said toroid means.
Claim 4
Dependent Claim
41 words
A microwave ferrimagnetic phase-shifter as in claim 1, wherein said waveguide and said toroid means are rectangular in shape and said toroid means touches the inside surface of the waveguide wall upon which said first and second magnet means are attached.
Claim 5
Dependent Claim
37 words
A microwave ferrimagnetic phase-shifter as in claim 3, wherein said first and second magnet means are bar-shape magnets and are attached to the top of said waveguide, and said electrical conductor means is a flat metal bar.
Claim 6
Independent Claim
113 words
A method for trimming the insertion phase of a microwave ferrimagnetic phase-shifter comprising the steps of: energizing the phase-shifter and determining its phase-shift relative to a refernce; placing a squat bar-magnet on the waveguide wall adjacent to each end of the ferrimagnetic core; placing a metallic bar with a flat surface area at each end across the top surface of the two squat magnets; sliding the metallic bar such that the surface area contact between the metallic bar end surfaces and the top surfaces of the two magnets varies, thus varying the flux linkages through the ferrimagnetic core, and thus varying the phase-shift of the phase-shift, until the desired reference phase-shift is obtained.
Claim 7
Independent Claim
113 words
A method for trimming the insertion phase of a microwave ferrimagnetic phase-shifter comprising the steps of: energizing the phase-shifter and determining its phase-shift relative to a refernce; placing a squat bar-magnet on the waveguide wall adjacent to each end of the ferrimagnetic core; placing a metallic bar with a flat surface area at each end across the top surface of the two squat magnets; sliding the metallic bar such that the surface area contact between the metallic bar end surfaces and the top surfaces of the two magnets varies, thus varying the flux linkages through the ferrimagnetic core, and thus varying the phase-shift of the phase-shift, until the desired reference phase-shift is obtained.
Claim 8
Dependent Claim
55 words
A method for trimming as in claim 5, further comprising the step of shaping each of the two squat magnets so that stray magnetic fields are compensated and the only remaining magnetic field runs longitudinally along the waveguide length thus giving this magnetic trimming the same effect in either direction of propagation along the waveguide.
Claim 9
Dependent Claim
35 words
A method for trimming as in claim 5, wherein said squat bar magnets and said metallic bar are placed on the side of the waveguide where the ferrimagnetic core comes closest to the waveguide wall.
Claim 10
Dependent Claim
25 words
A method for trimming as in claim 5, wherein said squat bar-magnets and said metalLic bar are placed on the top of said waveguide means.
References Cited (Backward Citations)
US2994841A
Cited
US3425003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |