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US 10,757,800 B1Granted
Stripline transmission lines with cross-hatched pattern return plane, where the striplines do not overlap any intersections in the cross-hatched pattern
AssigneeFlex Ltd.
InventorsMark Bergman, Franz Gisin
Life of this patent
Estimating the term…
Abstract
A circuit board transmission line structures has microstrip or stripline transmission line geometries and cross-hatch patterned return planes. The cross-hatch design structure of the return planes and the relative position of the cross-hatch pattern to the transmission lines are configured to increase the usable bandwidth of the transmission lines. By properly adjusting the size and shape of the cross-hatch pattern, the performance of the microstrip and stripline transmission lines can be largely restored to the performance where continuous, solid return planes are used.
Claims30
A circuit board transmission line structure comprising:
- a. a stack of one or more insulating layers;
- b. a transmission line stacked on a first surface of the stack of one or more insulating layers;
- and
- c. a cross-hatch patterned return plane stacked on a second surface of the stack of one or more insulating layers, wherein the cross-hatch patterned return plane includes a mesh of interconnected conductor lines that form a plurality of cross-hatch intersections and a plurality of cross-hatch regions that lack conductive material, each cross-hatch region is bounded by a respective perimeter of conductive material formed by a subset of the plurality of cross-hatch intersections and corresponding conductor lines that interconnect the subset of plurality of cross-hatch intersections, wherein each cross-hatch region includes a respective cross-hatch region width and a respective cross-hatch region height, the respective cross-hatch region width is defined as a first distance between a first pair of the subset of cross-hatch intersections included in the respective perimeter of the respective cross-hatch region, the first pair of cross-hatch intersections are not directly connected by one of the corresponding conductor lines, and the respective cross-hatch region height is defined as a second distance between a second pair of the subset of cross-hatch intersections included in the respective perimeter of the respective cross-hatch region, the second pair of cross-hatch intersections are not directly connected by one of the corresponding conductor lines, further wherein the respective cross-hatch region width is greater than the respective cross-hatch region height, and the cross-hatch patterned return plane and the transmission line are aligned such that the transmission line is vertically aligned between the plurality of cross-hatch intersections without overlapping any of the plurality of cross-hatch intersections, and the transmission line is oriented at an angle non-parallel and non-perpendicular to any of the interconnected conductor lines in the mesh.
1 more element
A circuit board transmission line structure comprising:
- a. a stack of one or more insulating layers;
- b. a pair of transmission lines forming a differential pair, the pair of transmission lines stacked on a first surface of the stack of one or more insulating layers;
- and
- c. a cross-hatch patterned return plane stacked on a second surface of the stack of one or more insulating layers, wherein the cross-hatch patterned return plane includes a mesh of interconnected conductor lines that form a plurality of cross-hatch intersections and a plurality of cross-hatch regions that lack conductive material, each cross-hatch region is bounded by a respective perimeter of conductive material formed by a subset of the plurality of cross-hatch intersections and corresponding conductor lines that interconnect the subset of plurality of cross-hatch intersections, wherein each cross-hatch region includes a respective cross-hatch region width and a respective cross-hatch region height, the respective cross-hatch region width is defined as a first distance between a first pair of the subset of cross-hatch intersections included in the respective perimeter of the respective cross-hatch region, the first pair of cross-hatch intersections are not directly connected by one of the corresponding conductor lines, and the respective cross-hatch region height is defined as a second distance between a second pair of the subset of cross-hatch intersections included in the respective perimeter of the respective cross-hatch region, the second pair of cross-hatch intersections are not directly connected by one of the corresponding conductor lines, further wherein the respective cross-hatch region width is greater than the respective cross-hatch region height, and the cross-hatch patterned return plane and the pair of transmission lines are aligned such that the pair of transmission lines are each vertically aligned between the plurality of cross-hatch intersections without overlapping any of the plurality of cross-hatch intersections, and the pair of transmission lines are each oriented at an angle non-parallel and non-perpendicular to any of the interconnected conductor lines in the mesh.
1 more element
Dependencies are inferred from the claim text.