Layered planar transmission lines

• US 5,408,053 A
• Filed: 11/30/1993
• Issued: 04/18/1995
• Est. Priority Date: 11/30/1993
• Status: Expired due to Fees

• Current Assignee: Hughes Aircraft Company (Rtx Corporation)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Young, Brian D.
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): Figlin, Cheryl R.
• Application Number:
  US08/160,015
• Time in Patent Office: 504 Days
• Field of Search: 174/262, 174/263, 174/264, 174/265, 174/266, 361/784, 361/792, 361/794
• US Class Current: 174/264
• CPC Class Codes: H01P 3/088 Stacked transmission lines
• CPC Class Codes: H05K 1/0219 Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
• CPC Class Codes: H05K 1/0265 characterized by the lay-out of or details of the printed conductors, e.g. reinforced conductors, redundant conductors, conductors having different cross-sections
• CPC Class Codes: H05K 1/0306 Inorganic insulating substrates, e.g. ceramic, glass
• CPC Class Codes: H05K 2201/09618 Via fence, i.e. one-dimensional array of vias
• CPC Class Codes: H05K 2201/09672 Superposed layout, i.e. in different planes parallel traces in one plane H05K2201/09236
• CPC Class Codes: H05K 2201/0979 Redundant conductors or connections, i.e. more than one current path between two points
• CPC Class Codes: H05K 3/4053 by thick-film techniques
• CPC Class Codes: H05K 3/4611 by laminating two or more circuit boards H05K3/4652 takes precedence
• CPC Class Codes: H05K 3/4629 laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets

Abstract

A transmission line structure including a central signal conductor stack of elongated conductive strips separated from each other by contiguous dielectric layers of a unitized multilayer circuit structure, a first ground conductor stack of elongated conductive strips separated from each other by contiguous dielectric layers and laterally separated from one side of the central signal conductor stack, and a second ground conductor stack of elongated conductive strips separated from each other by contiguous dielectric layers and laterally separated from another side of the central signal conductor stack such that the central conductor stack is laterally between the first and second ground conductor stacks.

Claims

1. A transmission line structure formed in a unitized multilayer circuit structure comprised of a vertical stack of dielectric layers, the transmission line structure comprising:

a vertical central signal conductor stack of elongated conductive strips vertically separated from each other by respective contiguous dielectric layers of the vertical stack of dielectric layers;

a plurality of conductive vias interconnecting the elongated conductive strips of said vertical central signal conductor stack;

a first vertical ground conductor stack of elongated conductive strips vertically separated from each other by respective contiguous dielectric layers of the vertical stack of dielectric layers and laterally separated from one side of said vertical central conductor stack such that said first vertical ground conductor stack of elongated conductive strips and said vertical central conductor stack are side by side along the elongated extents thereof;

a plurality of conductive vias interconnecting the elongated conductive strips of said first vertical ground conductor stack;

a second vertical ground conductor stack of elongated conductive strips vertically separated from each other by respective contiguous dielectric layers of the vertical stack of dielectric layers and laterally separated from another side of said vertical central conductor stack such that the vertical central conductor stack is laterally between the first and second vertical ground conductor stacks, and such that said vertical central conductor vertical stack, said first vertical ground conductor vertical stack, and said second vertical ground conductor vertical stack are side by side along the elongated extents thereof;

a plurality of conductive vias interconnecting the elongated conductive strips of said first vertical ground conductor stack; and

means for electrically connecting said first vertical ground conductor stack to said second vertical ground conductor stack at intervals along the elongated extents of said first and second vertical ground conductor stacks.

2. The transmission line structure of claim 1 wherein each of said vertical central conductor stack, said first vertical ground conductor stack, and said second vertical ground conductor stack includes an identical number of elongated conductive strips.

3. The transmission line structure of claim 2 wherein the elongated conductive strips of said vertical central conductor stack, said first vertical ground conductor stack, and said second vertical ground conductor stack are separated by predetermined contiguous dielectric layers such that said stacks have correspondingly layered elongated conductive strips wherein each elongated conductive strip of said vertical central conductor stack is laterally between an elongated conductive strip contained in said first vertical ground conductor stack and an elongated conductive strip contained in said second vertical ground conductor stack.

4. The transmission line structure of claim 3 wherein the elongated conductive strips of said vertical central conductor stack are of a uniform width, wherein the elongated conductive strips of said first vertical ground conductor stack are of a uniform width, and wherein the elongated conductive strips of said second vertical ground conductor stack are of a uniform width.

5. The transmission line structure of claim 4 wherein the elongated conductive strips of said vertical central conductor stack are laterally separated by uniform gaps from correspondingly layered elongated conductive strips of said first vertical ground conductor stack, and wherein the elongated conductive strips of said vertical central conductor stack are laterally separated by uniform gaps from correspondingly layered elongated conductive strips of said second vertical ground conductor stack.

6. A transmission line structure formed in a unitized multilayer circuit structure comprised of a vertical stack of dielectric layers, the transmission line structure comprising:

a vertical signal conductor stack of elongated conductive strips vertically separated from each other by contiguous dielectric layers of the vertical stack of dielectric layers;

a plurality of conductive vias interconnecting the elongated conductive strips of said vertical signal conductor stack;

a vertical ground conductor stack of elongated conductive strips vertically separated from each other by contiguous dielectric layers and laterally separated from said vertical signal conductor stack such that said vertical ground conductor stack and said vertical signal conductor stack are side by side along the elongated extents thereof; and

a plurality of conductive vias interconnecting the elongated conductive strips of said vertical ground conductor stack.

7. The transmission line structure of claim 6 wherein said signal conductor vertical stack and said vertical ground conductor stack include an identical number of elongated conductive strips.

8. The transmission line structure of claim 7 wherein the elongated conductive strips of said vertical signal conductor stack and said vertical ground conductor stack are separated by predetermined contiguous dielectric layers such that said vertical signal conductor stack and said vertical ground conductor stack have correspondingly layered elongated conductive strips wherein each elongated conductive strip of said vertical signal conductor stack is laterally adjacent a conductive strip of said vertical ground conductor stack.

9. The transmission line structure of claim 8 wherein the elongated conductive strips of said vertical signal conductor stack are of a uniform width, and wherein the elongated conductive strips of said vertical ground conductor stack are of a uniform width.

10. The transmission line structure of claim 9 wherein the elongated conductive strips of said vertical signal conductor stack are laterally separated by uniform gaps from correspondingly layered elongated conductive strips of said vertical ground conductor stack.