US4376920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded radio frequency transmission cable
Assignee: M/A-COM ACQUISITION CORP
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Filing: 1981-04-01
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Granted: 1983-03-15
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Expires: 2001-04-01
Abstract
Abstract The subject invention is directed to a cable comprising at least one center conductor, a dielectric surrounding said conductor and a plurality of metallic sheaths with at least two of said metallic sheaths separated, having a high series impedance and high propagation function for the path between said separated metallic sheaths. Said metallic sheaths are disposed in coaxial relationship to said at least one center conductor along the length of said cable. The cable design improves the shielding, suppression of EMI and RFI interference and minimizes the number and/or cost of the metallic sheaths required to obtain desired shielding.
Inventors
- 👤 Kenneth L. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/06; H01B; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
78 words
A cable for radio-frequency transmission comprising at least one center conductor, a dielectric surrounding said conductor, and at least two generally concentric separated inner and outer metallic sheaths defining an outer transmission path therebetween having a first propagation function, said center conductor and said inner metallic sheath defining an inner transmission path therebetween having a second propagation function, said first propagation function being significantly greater than twice said second propagation function to significantly attenuate radiation from said cable.
Claim 2
Dependent Claim
78 words
A cable for radio-frequency transmission comprising at least one center conductor, a dielectric surrounding said conductor, and at least two generally concentric separated inner and outer metallic sheaths defining an outer transmission path therebetween having a first propagation function, said center conductor and said inner metallic sheath defining an inner transmission path therebetween having a second propagation function, said first propagation function being significantly greater than twice said second propagation function to significantly attenuate radiation from said cable.
Claim 3
Dependent Claim
21 words
A cable as defined by claim 1, wherein said first propagation function is at least 10 times said second propagation function.
Claim 4
Dependent Claim
21 words
A cable as defined by claim 2, wherein said first propagation function is at least 50 times said second propagation function.
Claim 5
Dependent Claim
15 words
The cable as defined by claim 1, wherein a dielectric is positioned between said sheaths.
Claim 6
Dependent Claim
32 words
The cable as defined by claim 4, wherein said dielectric between said sheaths is a radio-frequency dissipative/absorptive material having a dielectric constant above about 2.3 and a dissipation factor above about 0.01.
Claim 7
Dependent Claim
18 words
The cable as defined by claim 4, wherein said dielectric between said sheaths is a loaded dielectric material.
Claim 8
Dependent Claim
22 words
The cable as defined by claim 2, wherein at least one of said separated metallic sheaths is a metallic and plastic laminate.
Claim 9
Dependent Claim
31 words
The cable as defined by claim 7, wherein said laminate sheath includes an adhesive on at least one side which adheres it to at least one adjacent layer in said cable.
Claim 10
Dependent Claim
24 words
The cable as defined by claims 1 or 7, wherein at least one of said metallic sheaths is a longitudinal pulled cigarette-wrapped metal tape.
Claim 11
Dependent Claim
21 words
The cable as defined by claims 1 or 2, wherein at least one of said metallic sheaths is a metallic braid.
Claim 12
Dependent Claim
13 words
The cable as defined by claim 1 and further comprising an outer jacket.
Claim 13
Dependent Claim
100 words
A triaxial cable for radio frequency transmission comprising a cylindrical center conductor, a cylindrical dielectric surrounding said center conductor, an inner metallic sheath disposed along said dielectric in coaxial relation to said center conductor defining an inner transmission path therebetween having a second propagation function, an intermediate dielectric surrounding said inner metallic sheath, and an outer metallic sheath disposed along said intermediate dielectric layer in coaxial relation to said center conductor, said cable having a triaxial path between said sheaths having a first propagation function significantly greater than twice said second propagation function to significantly attenuate radiation from said cable.
Claim 14
Dependent Claim
100 words
A triaxial cable for radio frequency transmission comprising a cylindrical center conductor, a cylindrical dielectric surrounding said center conductor, an inner metallic sheath disposed along said dielectric in coaxial relation to said center conductor defining an inner transmission path therebetween having a second propagation function, an intermediate dielectric surrounding said inner metallic sheath, and an outer metallic sheath disposed along said intermediate dielectric layer in coaxial relation to said center conductor, said cable having a triaxial path between said sheaths having a first propagation function significantly greater than twice said second propagation function to significantly attenuate radiation from said cable.
Claim 15
Dependent Claim
21 words
A cable as defined by claim 12, wherein said first propagation function is at least 10 times said second propagation function.
Claim 16
Dependent Claim
21 words
A cable as defined by claim 13, wherein said first propagation function is at least 50 times said second propagation function.
Claim 17
Dependent Claim
31 words
The triaxial cable as defined in claim 12, wherein the inner of said metallic sheaths is a laminate metallic and plastic tape wherein the outer metallic sheath is a metallic braid.
Claim 18
Dependent Claim
20 words
The triaxial cable as defined by claim 15, wherein said dielectric between said metallic sheaths is a loaded dielectric material.
Claim 19
Dependent Claim
21 words
The triaxial cable as defined by claim 12, wherein each of said metallic sheaths is a laminate plastic and metallic tape.
Claim 20
Dependent Claim
19 words
The triaxial cable as defined by claim 17, wherein said material between said metallic sheaths is a loaded dielectric.
Claim 21
Dependent Claim
18 words
The triaxial cable as defined by claim 12, wherein each of said metallic sheaths is a metallic braid.
Claim 22
Dependent Claim
19 words
The triaxial cable as defined by claim 19, wherein said dielectric between said metallic sheaths is a loaded dielectric.
Claim 23
Dependent Claim
14 words
The triaxial cable as defined by claim 12 and further comprising an outer jacket.
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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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |