Circuit board voltage plane impedance matching

A circuit board comprising:

• a first conductive plane;
• a second conductive plane, an impedance between the first conductive plane and the second conductive plane at an interior region of the first conductive plane is at a first impedance level;
• wherein the first conductive plane further includes:
• a transition region located at an edge region of the first conductive plane adjacent to the interior region, the transition region having a geometric configuration for providing a deliberate increase in the impedance between the first conductive plane and the second conductive plane from approximately the first impedance level towards a higher impedance level.

A computer system having a processor and a system memory comprising:

• a circuit board including:
• a first power plane;
• a second power plane, an impedance between the first power plane and the second power plane at an interior region of the circuit board is at a first impedance level;
• a dielectric layer positioned between the first power plane and the second power plane;
• a transition region located along an edge of the circuit board, the transition region having an interior side and an edge side, portions of the first and second power planes extending into the transition region, the impedance between the first power plane and the second power plane having a deliberate increase from approximately the first impedance level at the interior side of the transition region to a higher impedance level at the edge side of the transition region so as to reduce intensity of electromagnetic waves generated from the edge of the circuit board.