US4096461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet system for tunable YIG oscillator and tunable YIG filter
Assignee: US Philips Corp
•
Filing: 1977-01-28
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Granted: 1978-06-20
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Expires: 1997-01-28
Abstract
Abstract A magnet system for compensating the frequency difference between the oscillator frequency f o of a YIG oscillator and the central filter frequency f mi of a YIG filter to be independent of the oscillator frequency in which two pole-pieces are provided having opposing surfaces, one which has a raised portion, and one of which has a plate of magnetic material having a saturation magnetization smaller than the smallest field strength desired. The raised surface portion of the pole-piece has a height at which the frequency f o -f mi is independent of f o .
Inventors
- 👤 Peter Roschmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:37
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0205; H01F7/021; H01F3/00; H01F3/10; H01F3/14; H03; H03H; H03H9/00; H03H9/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A magnet system for tuning the combination of a tunable YIG filter having a center frequency f mi and a tunable YIG oscillator having a frequency f o comprising a pair of spaced pole-pieces having opposing surfaces forming a magnetic field therebetween, one of said surfaces having portion which is raised above the other portion a distance at which the frequency difference f o -f mi is independent of f o , and a plate of magnetic material on one said surfaces having a saturation magnetization which is smaller than the smallest magnetic field strength required.
Claim 2
Dependent Claim
96 words
A magnet system for tuning the combination of a tunable YIG filter having a center frequency f mi and a tunable YIG oscillator having a frequency f o comprising a pair of spaced pole-pieces having opposing surfaces forming a magnetic field therebetween, one of said surfaces having portion which is raised above the other portion a distance at which the frequency difference f o -f mi is independent of f o , and a plate of magnetic material on one said surfaces having a saturation magnetization which is smaller than the smallest magnetic field strength required.
Claim 3
Dependent Claim
22 words
A magnet system as claimed in claim 1 in which the plate of magnetic material is disposed opposite the raised surface portion.
Claim 4
Dependent Claim
21 words
A magnet system as claimed in claim 1 in which the plate of magnetic material is disposed opposite the non-raised portion.
Claim 5
Dependent Claim
22 words
A magnet system as claimed in claim 1 in which the plate of magnetic material is disposed on the non-raised surface portion.
Claim 6
Dependent Claim
34 words
A magnet system as claimed in claim 1 in which the magnetic material is selected from the group consisting of gadolinium + aluminum, dysprosium, and holmium substituted yttrium-iron garnets with a temperature-compensated saturation magnetization.
References Cited (Backward Citations)
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US3290610A
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US3668568A
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US3864647A
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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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |