Multilayer printed circuit board with pseudo-coaxial transmission lines
First Claim
1. A multilayer printed circuit board comprising:
- a plurality of planar layers made of dielectric material extending in parallel with each other in lateral and depthwise directions, said planar layers being formed one on top of the other in a vertical direction, at least one of said planar layers having signal conductor lines made of conductive material formed at spaced positions from each other in the lateral direction and extending in parallel with each other in the depthwise direction, and other ones of said planar layers above and below said at least one of said planar layers having return lines made of conductive material formed at spaced positions from each other in the lateral direction and extending in parallel with each other in the depthwise direction,wherein said return lines are grouped around associated ones of said signal conductor lines so as to form pseudo-coaxial transmission lines therewith; and
wherein said return lines are formed within said other ones of said planar layers spaced from each other and from the associated signal conductor line so as to be insulatively separated therefrom by said dielectric material of said planar layers.
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Accused Products
Abstract
A multilayer printed circuit board has a plurality of planar layers formed with signal conductor lines and return lines grouped around the conductor lines to form pseudo-coaxial transmission lines. The return lines are grouped symmetrically around each signal line, e.g. two, four, or eight return lines at circumferential positions around each signal line. Ground and power planes may be formed with the multilayer structure for shielding and/or for powering electronic components mounted on the structure. The multilayer techniques can also be used to form a multilayer extender card which minimizes crosstalk and is reduced in cost and assembly time as compared to conventional extender boards.
97 Citations
15 Claims
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1. A multilayer printed circuit board comprising:
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a plurality of planar layers made of dielectric material extending in parallel with each other in lateral and depthwise directions, said planar layers being formed one on top of the other in a vertical direction, at least one of said planar layers having signal conductor lines made of conductive material formed at spaced positions from each other in the lateral direction and extending in parallel with each other in the depthwise direction, and other ones of said planar layers above and below said at least one of said planar layers having return lines made of conductive material formed at spaced positions from each other in the lateral direction and extending in parallel with each other in the depthwise direction, wherein said return lines are grouped around associated ones of said signal conductor lines so as to form pseudo-coaxial transmission lines therewith; and wherein said return lines are formed within said other ones of said planar layers spaced from each other and from the associated signal conductor line so as to be insulatively separated therefrom by said dielectric material of said planar layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A multilayer printed circuit board comprising:
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a plurality of planar layers made of dielectric material extending in parallel with each other in lateral and depthwise directions, said planar layers being formed one on top of the other in a vertical direction, at least one of said planar layers having signal conductor lines made of conductive material formed at spaced positions from each other in the lateral direction and extending in parallel with each other in the depthwise direction, and other ones of said planar layers above and below said at least one of said planar layers having return lines made of conductive material formed at spaced positions from each other in the lateral direction and extending in parallel with each other in the depthwise direction, wherein said return lines are grouped around associated ones of said signal conductor lines so as to form pseudo-coaxial transmission lines therewith; and intermediate insulating layers made of dielectric material extending in parallel with said planar layers in the lateral and depthwise directions, each of which is interposed between adjacent ones of said planar layers containing said signal conductor lines and said return lines so as to insulatively separate said lines from each other.
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10. A multilayer printed circuit board comprising:
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a plurality of planar layers made of dielectric material formed one on top of the other in a vertical direction having signal conductor lines made of conductive material formed at spaced positions and return lines made of conductive material formed at spaced positions in parallel with and in spaced relation around associated ones of said signal conductor lines so as to form pseudo-coaxial transmission lines therewith; and an external plane made of conductive material formed on each external side in the vertical direction of said plurality of planar layers, wherein at least one of said external planes is a power plane connected to a power source for supplying power to electronic components to be mounted on said power plane.
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11. A multilayer printed circuit board comprising:
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a plurality of planar layers made of dielectric material formed one on top of the other having signal conductor lines made of conductive material formed at spaced positions and return lines made of conductive material formed at spaced positions in parallel with and in spaced relation around associated ones of said signal conductor lines so as to form pseudo-coaxial transmission lines therewith; and at least one internal plane made of conductive material formed in a central position within said plurality of planar layers. - View Dependent Claims (12, 13, 14, 15)
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Specification