US3753160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocal ferrite phase shifter having means detecting deviations of the energy from desired linear polarization
Assignee: DRS Sustainment Systems Inc
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Filing: 1972-04-20
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Granted: 1973-08-14
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Expires: 1992-04-20
Abstract
Abstract A ferrite phase shifter having a pair of nonreciprocal circular polarizers with a nonreciprocal phase shifter between them, including an electronic control for altering the magnetization of the nonreciprocal circular polarizers. This arrangement may be used to compensate for temperature and power changes and may provide a bandwidth substantially equal to the theoretical for a ferrite loaded waveguide of the same configuration. In the preferred embodiment the waveguide is square, the nonreciprocal circular polarizer (NRCP) is of the transversely magnetized quadrupole field type, and electronically controllable electromagnets at each corner of the NRCP sections provide the required level of magnetization to maintain accurate 90* phase shift of orthogonal vector components of the propagating electromagnetic wave. Also in the preferred embodiment, a linear polarizer at one end of the phase shifter includes a resistive film, and a detector diode is attached to the film to detect deviations of the propagating wave from the desired linear polarization. The detector diode is a part of a control circuit which adjusts the NRCP control magnet settings.
Inventors
- 👤 P Safran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:48
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
In a phase shifting means for use in an electromagnetic wave system comprising waveguide means, circular polarizer means including first ferrimagnetic means in said waveguide means for converting applied linearly polarized electromagnetic wave energy into substantially circularly polarized wave Energy, and phase shifter means including second ferrimagnetic means in said waveguide means and controllable means for magnetizing said second ferrimagnetic means axially of said waveguide means for effecting a controllable phase shift of said circularly polarized wave energy, the improvement comprising control means for controlling the magnetization of said first ferrimagnetic means, and circuit means for energizing said control means, said circuit means comprising variable means for changing said magnetization of said first ferrimagnetic means in response to a change in a condition tending to degrade said conversion from linear to circular polarization.
Claim 2
Dependent Claim
133 words
In a phase shifting means for use in an electromagnetic wave system comprising waveguide means, circular polarizer means including first ferrimagnetic means in said waveguide means for converting applied linearly polarized electromagnetic wave energy into substantially circularly polarized wave Energy, and phase shifter means including second ferrimagnetic means in said waveguide means and controllable means for magnetizing said second ferrimagnetic means axially of said waveguide means for effecting a controllable phase shift of said circularly polarized wave energy, the improvement comprising control means for controlling the magnetization of said first ferrimagnetic means, and circuit means for energizing said control means, said circuit means comprising variable means for changing said magnetization of said first ferrimagnetic means in response to a change in a condition tending to degrade said conversion from linear to circular polarization.
Claim 3
Dependent Claim
19 words
The improvement of claim 1 wherein said circular polarizer means comprise a transversely magnetized quadrupole field nonreciprocal circular polarizer.
Claim 4
Dependent Claim
28 words
The improvement of claim 2 wherein said variable means comprise preprogrammed means responsive to a change from one preselected wave energy frequency to another preselected wave energy frequency.
Claim 5
Dependent Claim
12 words
The improvement of claim 2 wherein said variable means are temperature responsive.
Claim 6
Dependent Claim
27 words
The improvement of claim 2 wherein said variable means comprise sensor means in said waveguide means for sensing divergence from a desired polarization of said wave energy.
Claim 7
Dependent Claim
52 words
The improvement of claim 5 including a linear polarizer on the side of said circular polarizer means away from said phase shifter means, said linear polarizer comprising absorptive means for absorbing wave energy polarized normal to a desired plane of polarization, said sensor means comprising means operatively connected to said absorptive means.
Claim 8
Dependent Claim
25 words
The improvement of claim 6 wherein said absorptive means comprise a resistive film and said sensor means comprise a diode in contact with said film.
Claim 9
Dependent Claim
13 words
The improvement of claim 2 wherein the waveguide is square in cross section.
Claim 10
Dependent Claim
16 words
The improvement of claim 2 wherein said first and second ferrimagnetic means comprise a single rod.
Claim 11
Dependent Claim
46 words
The improvement of claim 1 including second circular polarizer means including third ferrimagnetic means in said waveguide means for converting said phase shifted circularly polarized wave energy to linearly polarized wave energy, said phase shifter means being disposed between said first and second circular polarizer means.
Claim 12
Dependent Claim
21 words
The improvement of claim 10 wherein said first and second circular polarizer means comprise transversely magnetized quadrupole field nonreciprocal circular polarizers.
Claim 13
Dependent Claim
20 words
The improvement of claim 11 wherein said control means control the magnetization of both said first and third ferrimagnetic means.
Claim 14
Dependent Claim
27 words
The improvement of claim 12 wherein said variable means comprise sensor means in said waveguide means for sensing divergence from a desired polarization of said wave energy.
Claim 15
Dependent Claim
48 words
The improvement of claim 13 including a linear polarizer on the output side of said second circular polarizer means, said linear polarizer comprising absorptive means for absorbing wave energy polarized normal to a desired plane of polarization, said sensor means comprising means operatively connected to said absorptive means.
Claim 16
Dependent Claim
17 words
The improvement of claim 11 wherein said first, second and third ferrimagnetic means comprise a single rod.
References Cited (Backward Citations)
US3081438A
Cited
US3626335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |