Changes

The first thing you do in [[EM.Picasso]] is to define the background structure of your project in the Stack-up Manager. Planar metal objects like signal traces, microstrip lines, patches, etc. are modeled as PEC traces. Slots carved out of infinite ground planes are modeled as PMC traces. These are used to couple energy from one side to a substrate layer to the other side of the ground. Vertical vias and interconnects, shorting pins, plated-through holes, etc. are modeled as embedded object sets. You can define both metal and dielectric embedded objects. In [[EM.Picasso]], you draw only [[Surface Objects|surface objects]] like rectangles, circles, triangles, polygons, etc. on horizontal planes. In the case of embedded objects, you draw their cross sections at their base plane. [[EM.Picasso]] automatically extrudes the base geometry and extends it across the host substrate layer. There is an important approximation that [[EM.Picasso]] makes when modeling embedded objects. It assumes that volumetric objects carry vertical currents or sustain vertical fields only. This is the underpinning assumption of the 2.5D MoM, which limits the legitimate embedded object types to either slender columns and posts, or thin films sandwiched between two metal plates.

A Planar MoM simulation requires a source and one or more observables if you want to see any results at the end of your simulation. Since it is quite fast, [[EM.Picasso]] can be effectivley used to compute the port characteristics of planar circuits like filters, matching networks, directional couplers, etc. or the radiation characteristics of planar antennas and arrays. De-embedded sources are specifically provided for accurate port characterization. A plane wave source can be used to compute the reflection and transmission characteristics of planar layered periodic structures.