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Substrate issues

Question asked by ahelmi on Mar 24, 2010
Hi, I've a few questions about defining the substrates in momentum:

1. the 2-layer PCB i am trying to model has no ground plane. hence i simulate the model with 2 conducting layers but no GND layer. will this affect the simulation accuracy?
2. is it possible to define 2 different substrates in the same layer? say for example, a small  1 mm x 1mm square is made of FR4 but it is enclosed by a bigger 4mm x 4mm alumina
3. it seems that the dielectric layers go off to infinity. is it possible to limit their area and let everything else be freespace? say just a 4mm x 4mm area of alumina and freespace everywhere elese? how can this be done?

thanks for your time