Although AN-SOF was developed to simulate wire structures, we have been able to extend the calculation engine to also model PCBs and microstrip antennas that meet the following requirements:

• The structure must have a single layer of dielectric substrate. Multiple layers are not supported.
• When the substrate has a finite size, the traces must be separated from the edges by at least 5 times the width of a trace.
• The dielectric substrate is backed up by a perfectly conducting ground plane that cannot be removed. Vias that go through the substrate and connect traces to the ground plane can be added to feed an antenna or PCB.