US4605915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stripline circuits isolated by adjacent decoupling strip portions
Assignee: Cubic Corp
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Filing: 1984-07-09
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Granted: 1986-08-12
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Expires: 2004-07-09
Abstract
Abstract An electromagnetically-decoupled stripline circuit on a conventional circuitboard includes a center groundplane and two coplanar striplines that are sandwiched within a dielectric material between two outer groundplanes. A plurality of connectors conductively interconnect the groundplanes. The center groundplane has a decoupling strip portion lying between the striplines that is split in two by a gap. The gap traverses the direction an electromagnetic field would propagate from one of the striplines toward the other, and a pair of the connectors are positioned to straddle the gap. Z-wires, plated-through holes, and additional gaps may be employed.
Inventors
- 👤 Henry D. Marshall
- 👤 Jeffrey K. Iida
- 👤 Douglas J. Crow
- 👤 Lawrence O. Friend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:09
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/085; H05; H05K; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218; H05K1/0219; H05K1/0237; H05K2201/00; H05K2201/07; H05K2201/0707; H05K2201/0715; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/09618; H05K3/00; H05K3/40; H05K3/4038; H05K3/4046; H05K3/42; H05K3/429
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
343 words
An isolated stripline circuitboard for electromagnetically isolating adjacent striplines disposed therein, comprising: a pair of substantially parallel outer groundplanes; a dielectric material sandwiched between said pair of outer groundplanes; at least two substantially coplanar striplines disposed within said dielectric material in substantially parallel relation to said outer groundplanes; a center groundplane disposed within said dielectric material adjacent and coplanar to said striplines, said center groundplane having at least one decoupling strip portion, each decoupling strip portion positioned between adjacent striplines wherein each decoupling strip portion includes a nonconductive gap within the decoupling strip portion; at least one pair of additional decoupling strips disposed within said dielectric material, one of the additional decoupling strips of said additional decoupling strip pair positioned adjacent one of said decoupling strip portions and between said one of said decoupling strip portions and one of said outer groundplanes, the other of the additional decoupling strips of said additional decoupling strip pair positioned adjacent said one of said decoupling strip portions and between said one of said decoupling strip portions and the other of said outer groundplanes wherein each additional decoupling strip includes a nonconductive gap within the additional decoupling strip; a plurality of conductive connectors extending from one of said outer groundplanes through said dielectric material, through said center groundplane, and through each pair of additional decoupling strips to the other of said outer groundplanes, for electrically interconnecting said outer groundplanes to said center groundplane and each one of said pair of additional decoupling strips, certain ones of said conductive connectors extending through at least one of said decoupling strip portions and at least one of said additional decoupling strips at predetermined spaced apart intervals adjacent a respective nonconductive gap; and wherein said outer groundplanes, said certain ones of said conductive connectors, each of said decoupling strip portions and each of said pair of additional decoupling strips permit current loops to flow therethrough when a current is flowing through at least one of said adjacent striplines so as to substantially reduce E-field and H-field coupling between adjacent coplanar striplines.
Claim 2
Dependent Claim
343 words
An isolated stripline circuitboard for electromagnetically isolating adjacent striplines disposed therein, comprising: a pair of substantially parallel outer groundplanes; a dielectric material sandwiched between said pair of outer groundplanes; at least two substantially coplanar striplines disposed within said dielectric material in substantially parallel relation to said outer groundplanes; a center groundplane disposed within said dielectric material adjacent and coplanar to said striplines, said center groundplane having at least one decoupling strip portion, each decoupling strip portion positioned between adjacent striplines wherein each decoupling strip portion includes a nonconductive gap within the decoupling strip portion; at least one pair of additional decoupling strips disposed within said dielectric material, one of the additional decoupling strips of said additional decoupling strip pair positioned adjacent one of said decoupling strip portions and between said one of said decoupling strip portions and one of said outer groundplanes, the other of the additional decoupling strips of said additional decoupling strip pair positioned adjacent said one of said decoupling strip portions and between said one of said decoupling strip portions and the other of said outer groundplanes wherein each additional decoupling strip includes a nonconductive gap within the additional decoupling strip; a plurality of conductive connectors extending from one of said outer groundplanes through said dielectric material, through said center groundplane, and through each pair of additional decoupling strips to the other of said outer groundplanes, for electrically interconnecting said outer groundplanes to said center groundplane and each one of said pair of additional decoupling strips, certain ones of said conductive connectors extending through at least one of said decoupling strip portions and at least one of said additional decoupling strips at predetermined spaced apart intervals adjacent a respective nonconductive gap; and wherein said outer groundplanes, said certain ones of said conductive connectors, each of said decoupling strip portions and each of said pair of additional decoupling strips permit current loops to flow therethrough when a current is flowing through at least one of said adjacent striplines so as to substantially reduce E-field and H-field coupling between adjacent coplanar striplines.
Claim 3
Dependent Claim
23 words
The circuitboard of claim 1 wherein said center groundplane includes at least one additional nonconductive gap in selected portions of said center groundplane.
Claim 4
Dependent Claim
25 words
The circuitboard of claim 1 wherein said connectors are comprised of plated-through holes mounted in electrical connection to said center groundplane and said outer groundplanes.
Claim 5
Dependent Claim
35 words
The circuitboard of claim 1 wherein said connectors are comprised of Z-shaped wires mounted within holes formed through said circuitboard, said Z-shaped wires mounted in electrical connection with said center groundplane and said outer groundplanes.
Claim 6
Dependent Claim
332 words
A circuitboard assembly for electromagnetically isolating adjacent stripline circuits disposed therein, comprising: a pair of substantially parallel outer groundplanes; a dielectric material sandwiched between said pair of outer groundplanes; a center groundplane disposed within said dielectric material parallel to said outer groundplanes, said center groundplane having at least one decoupling strip portion, each decoupling strip portion positioned adjacent and between adjacent stripline circuits disposed coplanar to said center groundplane wherein each decoupling strip portion includes a nonconductive gap within the decoupling strip portion; at least one pair of additional decoupling strips disposed within said dielectric material, one of the additional decoupling strips of said additional decoupling strip pair positioned adjacent one of said decoupling strip portions and between said one of said decoupling strip portions and one of said outer groundplanes, the other of the additional decoupling strips of said additional decoupling strip pair positioned adjacent said one of said decoupling strip portions and between said one of said decoupling strip portions and the other of said outer groundplanes wherein each additional decoupling strip includes a nonconductive gap within the additional decoupling strip; a plurality of conductive connectors extending from one of said outer groundplanes through said dielectric material, through said center groundplane, and through each pair of additional decoupling strips to the other of said outer groundplanes, for electrically interconnecting said outer groundplanes to said center groundplane and each one of said pair of additional decoupling strips, certain ones of said conductive connectors extending through at least one of said decoupling strip portions and at least one of said additional decoupling strips at predetermined spaced apart intervals adjacent a respective nonconductive gap; and wherein said outer groundplanes, said certain ones of said conductive connectors, each of said decoupling strip portions and each of said pair of additional decoupling strips permit current loops to flow therethrough when a current is flowing through at least one stripline circuit so as to substantially reduce E-field and H-field coupling between an adjacent coplanar stripline circuit.
Claim 7
Dependent Claim
332 words
A circuitboard assembly for electromagnetically isolating adjacent stripline circuits disposed therein, comprising: a pair of substantially parallel outer groundplanes; a dielectric material sandwiched between said pair of outer groundplanes; a center groundplane disposed within said dielectric material parallel to said outer groundplanes, said center groundplane having at least one decoupling strip portion, each decoupling strip portion positioned adjacent and between adjacent stripline circuits disposed coplanar to said center groundplane wherein each decoupling strip portion includes a nonconductive gap within the decoupling strip portion; at least one pair of additional decoupling strips disposed within said dielectric material, one of the additional decoupling strips of said additional decoupling strip pair positioned adjacent one of said decoupling strip portions and between said one of said decoupling strip portions and one of said outer groundplanes, the other of the additional decoupling strips of said additional decoupling strip pair positioned adjacent said one of said decoupling strip portions and between said one of said decoupling strip portions and the other of said outer groundplanes wherein each additional decoupling strip includes a nonconductive gap within the additional decoupling strip; a plurality of conductive connectors extending from one of said outer groundplanes through said dielectric material, through said center groundplane, and through each pair of additional decoupling strips to the other of said outer groundplanes, for electrically interconnecting said outer groundplanes to said center groundplane and each one of said pair of additional decoupling strips, certain ones of said conductive connectors extending through at least one of said decoupling strip portions and at least one of said additional decoupling strips at predetermined spaced apart intervals adjacent a respective nonconductive gap; and wherein said outer groundplanes, said certain ones of said conductive connectors, each of said decoupling strip portions and each of said pair of additional decoupling strips permit current loops to flow therethrough when a current is flowing through at least one stripline circuit so as to substantially reduce E-field and H-field coupling between an adjacent coplanar stripline circuit.
Claim 8
Dependent Claim
23 words
The circuitboard of claim 5 wherein said center groundplane includes at least one additional nonconductive gap in selected portions of said center groundplane.
Claim 9
Dependent Claim
29 words
The circuitboard of claim 5 wherein said connectors are comprised of plated-through holes mounted in electrical connection to said center groundplane, said additional decoupling strips and said outer groundplanes.
Claim 10
Dependent Claim
29 words
The circuitboard of claim 5 wherein said connectors are comprised of z-shaped wires mounted in electrical connection with said center groundplane, said additional decoupling strips and said outer groundplanes.
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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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |