Patent US4816614A successfully refreshed from Google Patents.
US4816614A
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High frequency attenuation cable
Assignee: Raychem Ltd
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Filing: 1987-01-20
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Granted: 1989-03-28
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Expires: 2007-01-20
Abstract
Abstract High frequency attenuation cable has a core surrounded by an EMI shielding layer. The core comprises at least one inner conductor, at least one high frequency absorption layer or non-amorphous magnetic metal tape surrounding, but not necessarily adjacent to, the inner conductor, and at least one dielectric layer surrounding, but not necessarily adjacent to, the inner conductor. The constructions according to the invention enable improved attenuation at frequencies in the range of 10-100 MHz.
Inventors
- 👤 Stephen M. Baigrie
- 👤 Alan L. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:04
CPC Classifications
H; H01; H01B; H01B11/00; H01B11/02; H01B11/12; H01B11/14; H01B11/146; H01B11/143
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
78 words
A high frequency attenuation cable which comprises a core comprising: at least one inner conductor; at least one high frequency absorption layer of non-amorphous magnetic metal tape surrounding the inner conductor; at least one dielectric layer surrounding the inner conductor; and a second high frequency absorption layer comprising a polymeric material filled with magnetic particles surrounding the conductor; and an EMI shielding layer surrounding the core, the first high frequency absorption layer being adjacent to the inner conductor.
Claim 2
Dependent Claim
78 words
A high frequency attenuation cable which comprises a core comprising: at least one inner conductor; at least one high frequency absorption layer of non-amorphous magnetic metal tape surrounding the inner conductor; at least one dielectric layer surrounding the inner conductor; and a second high frequency absorption layer comprising a polymeric material filled with magnetic particles surrounding the conductor; and an EMI shielding layer surrounding the core, the first high frequency absorption layer being adjacent to the inner conductor.
Claim 3
Dependent Claim
23 words
A high frequency attenuation cable according to claim 1 wherein the magnetic metal tape layer is in the form of a helical warp.
Claim 4
Dependent Claim
23 words
A high frequency attenuation cable according to claim 2 wherein the magnetic metal tape layer comprises a double layer of helically wrapped tape.
Claim 5
Dependent Claim
22 words
A high frequency attenuation cable according to claim 1 wherein the magnetic metal tape layer is in the form of a braid.
Claim 6
Dependent Claim
18 words
A high frequency attenuation cable according to claim 1 wherein the magnetic tape layer comprises a nickel-iron alloy.
Claim 7
Dependent Claim
20 words
A high frequency attenuation cable according to claim 1 wherein the second high frequency absorption layer comprises a ferrite-loaded polymer.
Claim 8
Dependent Claim
89 words
A high frequency attenuation cable comprising a plurality of cores, each core comprising: at least one inner conductor; at least one high frequency absorption layer of non-amorphous magnetic metal tape surrounding the inner conductor; at least one dielectric layer surrounding the inner conductor; and a second high frequency absorption layer comprising a polymeric material filled with magnetic particles surrounding the conductor; and a common EMI shielding layer surrounding the plurality of cores, the first high frequency absorption layer of each of said cores being adjacent to the inner conductor.
Claim 9
Dependent Claim
89 words
A high frequency attenuation cable comprising a plurality of cores, each core comprising: at least one inner conductor; at least one high frequency absorption layer of non-amorphous magnetic metal tape surrounding the inner conductor; at least one dielectric layer surrounding the inner conductor; and a second high frequency absorption layer comprising a polymeric material filled with magnetic particles surrounding the conductor; and a common EMI shielding layer surrounding the plurality of cores, the first high frequency absorption layer of each of said cores being adjacent to the inner conductor.
Claim 10
Dependent Claim
18 words
A high frequency attenuation cable according to claim 7 wherein the magnetic tape layer comprises a nickel-iron alloy.
Claim 11
Dependent Claim
20 words
A high frequency attenuation cable according to claim 7 wherein the second high frequency absorption layer comprises a ferrite-loaded polymer.
Claim 12
Dependent Claim
79 words
A high frequency attenuation cable which comprises a core comprising: at least one inner conductor; at least one high frequency absorption layer of non-amorphous magnetic metal tape surrounding the inner conductor; at least one dielectric layer surrounding the inner conductor; and a second high frequency absorption layer comprising a polymeric material filled with magnetic particles surrounding the conductor; and an EMI shielding layer surrounding the core, the first high frequency absorption layer being adjacent to the EMI shielding layer.
Claim 13
Dependent Claim
79 words
A high frequency attenuation cable which comprises a core comprising: at least one inner conductor; at least one high frequency absorption layer of non-amorphous magnetic metal tape surrounding the inner conductor; at least one dielectric layer surrounding the inner conductor; and a second high frequency absorption layer comprising a polymeric material filled with magnetic particles surrounding the conductor; and an EMI shielding layer surrounding the core, the first high frequency absorption layer being adjacent to the EMI shielding layer.
Claim 14
Dependent Claim
18 words
A high frequency attenuation cable according to claim 10 wherein the magnetic tape layer comprises a nickel-iron alloy.
Claim 15
Dependent Claim
20 words
A high frequency attenuation cable according to claim 10 wherein the second high frequency absorption layer comprises a ferrite-loaded polymer.
Claim 16
Dependent Claim
23 words
A high frequency attenuation cable according to claim 10 wherein the magnetic metal tape layer is in the form of a helical wrap.
Claim 17
Dependent Claim
23 words
A high frequency attenuation cable according to claim 13 wherein the magnetic metal tape layer comprises a double layer of helically wrapped tape.
Claim 18
Dependent Claim
22 words
A high frequency attenuation cable according to claim 10 wherein the magnetic metal tape layer is in the form of a braid.
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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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |