Ground Plane Modeller

Omega PLUS is now augmented by the Ground Plane Modeller module. With this module, Omega PLUS simulates two-sided boards and multilayer boards with partial power and ground planes. The Ground Plane Modeller automatically incorporates equivalent circuits for no-ground and imperfect-ground designs into PCB transmission-line networks without the intervention of the user. Solid ground planes offer the highest level of shielding against crosstalk and emissions. However, for compactness and manufacturing economy, no-ground and partial ground planes are often employed. Slots and copper areas are often encountered, especially in double-sided boards. If there are copper areas and power nets, these are analyzed to find where the copper areas are coupled to the tracks. Figure 1 shows a board with an open region. This opening in the ground plane allows electromagnetic emissions, from the layer below, to pass through. In Figure 2 the board has split planes. Also, tracks crossing power and ground plane discontinuities experience sudden changes in track impedances. Fig. 1 Opening in a ground plane.   Fig. 2 Split ground with narrow gaps. This latest advancement is unique. With it, accurate simulation of boards with discontinuous grounds and no grounds can now be achieved.

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