EM.Picasso® is a versatile planar structure simulator for modeling and design of printed antennas, planar microwave circuits, and layered periodic structures. EM.Picasso's simulation engine is based on a 2.5-D full-wave Method of Moments (MoM) formulation that provides the ultimate modeling accuracy and computational speed for open-boundary multilayer structures. It can handle planar structures with arbitrary numbers of metal layouts, slot traces, vertical interconnects and lumped elements interspersed among different substrate layers. You can use EM.Picasso to model large finite-sized antenna arrays as well as infinite periodic structures such as frequency selective surfaces.
Since its introduction in 2002, EM.Picasso assumes that you planar structure has been successfully used by numerous users around the globe a substrate (background structure) of infinite lateral extents. Your substrate can be a dielectric half-space, or a single conductor-backed dielectric layer (as in industrymicrostrip components or patch antennas), academia and governmentor simply the unbounded free space, or any arbitrary multilayer stack-up configuration. The new In the special case of a free space substrate, EM.Picasso 2013 has been totally reconstructed based on our integrated will behave similar to [[EM.CubeLibera]] software foundation's Surface MoM simulator. This integration has introduced far more powerful CAD utilitiesIn all the other cases, greater geometrical varietyit is important to keep in mind the infinite extents of the background substrate structure. For example, and you cannot use EM.Picasso to analyze a vast array of capabilities like parametric sweeppatch antenna with a finite-sized dielectric substrate, if the substrate edge effects are of concern in your modeling problem. [[optimizationEM.Tempo]], data visualization and post-processing computations. The new foundation also facilitates import and export is recommended for the modeling of many popular CAD formats and provides a seamless interface with our other simulation toolsfinite-sized substrates.
=== An Overview of Planar Method of Moments ===
The currents in a planar MoM simulation are discretized as a collection of elementary currents with small finite spatial extents. These elementary currents are called basis functions and obviously have a vectorial nature. The total currents (solution of the problem) are summations of these elementary currents. The basis functions are well defined and easy to calculate; however, their amplitudes are initially unknown in a MoM problem. Through the planar MoM solution, you find these unknown amplitudes. Once the total currents are known, you can calculate the fields everywhere in the structure.
Click here to learn more about the theory of [[Planar Method of Moments]].
== Building a Planar Structure ==
You couple two or more sources using the '''Port Definition Dialog'''. To do so, you need to change the default port assignments. First, delete all the ports that are to be coupled from the Port List of the dialog. Then, define a new port by clicking the '''Add''' button of the dialog. This opens up the Add Port dialog, which consists of two tables: '''Available''' sources on the left and '''Associated''' sources on the right. A right arrow ('''-->''') button and a left arrow ('''<--''') button let you move the sources freely between these two tables. You will see in the "Available" table a list of all the sources that you deleted earlier. You may even see more available sources. Select all the sources that you want to couple and move them to the "Associated" table on the right. You can make multiple selections using the keyboard's '''Shift''' and '''Ctrl''' keys. Closing the Add Port dialog returns you to the Port Definition dialog, where you will now see the names of all the coupled sources next to the name of the newly added port.
{{Note|It is your responsibility to set up coupled ports and coupled [[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|[[Transmission Lines|transmission lines]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]] properly. For example, to excite the desirable odd mode of a coplanar waveguide (CPW), you need to create two rectangular slots parallel to and aligned with each other and place two gap sources on them with the same offsets and opposite polarities. To excite the even mode of the CPW, you use the same polarity for the two collocated gap sources. Whether you define a coupled port for the CPW or not, the right definition of sources will excite the proper mode. The couple ports are needed only for correct calculation of the port characteristics.}}
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