Wave transmission lines and networks – Long lines – Strip type
Patent
1996-12-31
1998-10-06
Gensler, Paul
Wave transmission lines and networks
Long lines
Strip type
333 1, H01P 308
Patent
active
058183159
ABSTRACT:
Methods and apparatus for controlling signal line impedance in an electronic circuit board by altering the characteristics of a grid-like ground plane. The ground plane is arranged adjacent and parallel to a signal plane of the circuit board, and includes a grid-like pattern of conductors. The grid-like pattern of conductors forms a large number of grid elements. The size of the grid elements in a portion of the ground plane varies along at least a portion of the length of a corresponding signal trace of the signal plane in order to provide a desired impedance for the signal trace. The grid element size variation may be in accordance with a ramp function, a staircase function, a square wave function, as well as suitable combinations of these and other functions. This variation of grid element size in a grid-like ground plane provides cost-effective and flexible control of signal trace impedance, without requiring any alteration in signal trace or dielectric material characteristics.
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Gensler Paul
Lucent Technologies - Inc.
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