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US5023573A
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Compact frequency selective limiter configuration
Assignee: Westinghouse Electric Corp
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Filing: 1989-09-21
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Granted: 1991-06-11
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Expires: 2009-09-21
Abstract
Abstract A frequency selective limiting device is described incorporating a pair of generally planar ferrite members and a plurality of signal-carrying conductors positioned between the ferrite members. The plurality of signal-carrying conductors are located on a single YIG substrate. A D.C. bias field may be generated by a common magnetic source positioned on the surface of the substrate opposite the plurality of signal-carrying conductors.
Inventors
- 👤 John D. Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:21
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/006; H01; H01P; H01P1/00; H01P1/20; H01P1/215
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
92 words
A device for attenuating microwave signals above a preselected power level passed therethrough comprising: a pair of planar ferrite members; a plurality of signal-carrying conductors positioned between said ferrite members for carrying the microwave signals on an axis substantially parallel thereto; and a planar ground plane surrounding the ferrite members in spaced relation with respect to the conductors by a selected distance, said signal carrying conductors being separated by at least ten times the distance from the ground plane to the conductors such that microwave field coupling between adjacent conductors is negligible.
Claim 2
Independent Claim
92 words
A device for attenuating microwave signals above a preselected power level passed therethrough comprising: a pair of planar ferrite members; a plurality of signal-carrying conductors positioned between said ferrite members for carrying the microwave signals on an axis substantially parallel thereto; and a planar ground plane surrounding the ferrite members in spaced relation with respect to the conductors by a selected distance, said signal carrying conductors being separated by at least ten times the distance from the ground plane to the conductors such that microwave field coupling between adjacent conductors is negligible.
Claim 3
Dependent Claim
25 words
The device according to claim 1 further comprising magnetic means for providing at least a portion of a DC biasing field for said ferrite member.
Claim 4
Dependent Claim
17 words
The device according to claim 2 wherein said magnetic means provides RF shielding for said signal-carrying conductors.
Claim 5
Dependent Claim
23 words
The device according to claim 2 wherein said magnetic means is positioned against a side of said ferrite member opposite the signal-carrying conductors.
Claim 6
Dependent Claim
25 words
The device according to claim 1 wherein attenuation of the microwave signals having a power level below said predetermined threshold power level is substantially zero.
Claim 7
Dependent Claim
17 words
The device according to claim 1 wherein said ferrite members are made solely from a YIG material.
Claim 8
Dependent Claim
17 words
The device according to claim 1 wherein said signal-carrying conductors means are made from a gold material.
Claim 9
Dependent Claim
40 words
The device according to claim 1 wherein the device has a selected hand width of operation from about 2.4 to about 5.4 GHZ, attenuation of microwave signals in the device varies less than about 2 dB over said hand width.
Claim 10
Dependent Claim
29 words
The device according to claim 1 further including biasing means for establishing a magnetic biasing field in the plane of the ferrite and transverse to the signal carrying conductors.
Claim 11
Dependent Claim
15 words
The device according to claim 9 in which the biasing field is about 35 Oe.
Claim 12
Dependent Claim
47 words
The device according to claim 1 wherein the ferrite members have a width (w) as measured in a direction between the adjacent conductors and overall thickness (t) as measured normal to the confronting ferrite members defining an aspect ratio w/t of greater than about 12.7 per conductor.
Claim 13
Dependent Claim
13 words
The device according to claim 11 wherein the aspect ratio is about 63.5.
Claim 14
Independent Claim
80 words
A device for attenuating microwave signals above a preselected power level passed therethrough comprising: a pair of generally planar ferrite members in confronting relationship; a plurality of signal carrying conductors positioned between the ferrite members for carrying the microwave signals on an axis substantially parallel thereto; and a planar ground plane spaced from the conductors surrounding the ferrite members, said conductors being spaced from each other by a distance at least approximately 10 times the distance to the ground plane.
Claim 15
Independent Claim
80 words
A device for attenuating microwave signals above a preselected power level passed therethrough comprising: a pair of generally planar ferrite members in confronting relationship; a plurality of signal carrying conductors positioned between the ferrite members for carrying the microwave signals on an axis substantially parallel thereto; and a planar ground plane spaced from the conductors surrounding the ferrite members, said conductors being spaced from each other by a distance at least approximately 10 times the distance to the ground plane.
Claim 16
Independent Claim
86 words
A device for attenuating microwave signals above a preselected power level passed therethrough comprising: a pair of generally planar ferrite members in confronting relationship; a plurality of signal carrying conductors positioned between said ferrite members for carrying the microwave signals on an axis substantially parallel thereto; a pair of ground planes spaced from the conductors and disposed on the ferrite members, said conductors being separated from each other by a distance at least approximately 10 times the distance from the planar ground planes to the conductors.
Claim 17
Independent Claim
86 words
A device for attenuating microwave signals above a preselected power level passed therethrough comprising: a pair of generally planar ferrite members in confronting relationship; a plurality of signal carrying conductors positioned between said ferrite members for carrying the microwave signals on an axis substantially parallel thereto; a pair of ground planes spaced from the conductors and disposed on the ferrite members, said conductors being separated from each other by a distance at least approximately 10 times the distance from the planar ground planes to the conductors.
Claim 18
Dependent Claim
19 words
The device according to claim 14 wherein the ground planes are interconnected on opposite sides of the ferrite members.
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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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |