EmCAD

EmCAD (Copyright 2015 Walter Steffè) is a software tool distributed under the terms of the GNU General Public License, Version 2 or later.

Downloads: Windows 64 bit   Source code   User Guide

EmCAD constitutes the user front-end of the Hierarchical Electromagnetic Modeler providing a graphical user interface for the definition of the electromagnetic problems and the submission of the modelization tasks.

The definition of an electromagnetic problem encompasses the following activities:

  • Drawing of the part geometry using a CAD software (non included in EmCAD). The CAD system should have the "multibody" capability making it possible to place different solid bodies and surfaces inside a single part file.
    Solid bodies are used to define dielectric objects while surfaces are used to define boundary conditions or waveguide ports.

  • Importing into the EmCAD environment of a "STEP" file associated with a CAD part or a CAD assembly.

  • Definition of electrical properties associated with materials and boundary conditions.

  • Assignment of material properties to dielectric bodies and of boundary conditions to the related surfaces.

  • Specification of the waveguide ports.

  • Specification of the global project properties (frequency band, the mesh size...)

  • Domain Decomposition and Meshing of the electromagnetic structure.

  • Saving of the part data into an EmCAD file.

  • Submission a modelization request to the remote service.

  • Saving of the EmCAD data which now include the generated equivalent circuits.

Once all the subcircuits have been computed it is possible to compute and plot the frequency response of the electromagnetic structure:

  • Specification of the frequency band and of the type of network parameter (Scattering, Impedance...) associated with the frequency response.

  • Submission of a request for Frequency Domain Analysis.

  • The frequency response can be plotted inside of the EmCAD environment.

  • Saving of the EmCAD data which now includes the frequency response and the related plots.

The circuital model associated with the electromagnetic structure may be exported in the Spice format and used in an external simulator. This circuit is the result of a model order reduction that is applied to the global circuit (generated by the sub-component circuits) and is characterized by a very compact size.