US4169253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency offset technique for YIG devices
Assignee: Lockheed Martin Tactical Systems Inc
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Filing: 1978-05-08
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Granted: 1979-09-25
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Expires: 1998-05-08
Abstract
Abstract An improved electronic structure for achieving a frequency offset between two or more YIG devices tuned by a single electro-magnet. The structure does not require different sizes of YIG spheres, different magnet gap spacings, or modified coil windings on the electro-magnet, but relies entirely upon the anisotropy variations of the single crystal structure of the YIG spheres when they are mounted on respective tuning rods on a specific axis and rotated under a variable field for a fixed frequency input.
Inventors
- 👤 Morris Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:56
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
The method of producing in a pair of YIG devices, a relatively fixed frequency offset between the outputs of said devices, comprising the steps of: Providing a single electro-magnet defining a substantially constant operative gap; Mounting said YIG devices upon coaxially aligned rods within a single housing disposed within said gap, such that each device may be rotated about its 110 axis, with a single loop surrounding each device; Determining an index point for each device at which both devices output the same frequency at resonance in response to a given input frequency and given magnetic field; and Rotating one of said rods relative to the other to a degree sufficient to obtain a frequency output at resonance equivalent to the desired frequency offset, in accordance with the formula: ##EQU2## where f o =resonant frequency θ=degree rotation K l /M s =First order anisotropy constant for YIG=-43 Oersteds) H o =perpendicular magnetic field (Oersteds)
Claim 2
Independent Claim
154 words
The method of producing in a pair of YIG devices, a relatively fixed frequency offset between the outputs of said devices, comprising the steps of: Providing a single electro-magnet defining a substantially constant operative gap; Mounting said YIG devices upon coaxially aligned rods within a single housing disposed within said gap, such that each device may be rotated about its 110 axis, with a single loop surrounding each device; Determining an index point for each device at which both devices output the same frequency at resonance in response to a given input frequency and given magnetic field; and Rotating one of said rods relative to the other to a degree sufficient to obtain a frequency output at resonance equivalent to the desired frequency offset, in accordance with the formula: ##EQU2## where f o =resonant frequency θ=degree rotation K l /M s =First order anisotropy constant for YIG=-43 Oersteds) H o =perpendicular magnetic field (Oersteds)
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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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |