This practical software performs highly accurate full-wave electromagnetic (EM) simulation of planarly layered structures. It allows the user to extract N-Port circuit S- or Z-parameters and simulate microstrip and stripline circuits, as well as most printed circuits common to microwave engineering, including filters, patch antennas, and matching networks. The software can be used as a tool for design engineers who want to simulate radiating structures, with no practical limitation on the number of layers. It can also be used by researchers who can use it to simulate Green's functions of the layered media. A translator permits conversion of SONNET geometry files to EMPLAN files.