VSim for Electromagnetics

VSimEMThe fast, powerful FDTD for Electromagnetics that solves electromagnetic problems for a variety of material types, yielding engineering outputs that can be used for design of electromagnetic devices.



VSim for Electromagnetics (VSimEM) is a flexible, multiplatform, high-performance, parallel software tool for computationally intensive electromagnetic, electrostatic, and magnetostatic simulations in the presence of complex dielectric and metallic shapes with accurate simulation of curved geometries using a conformal mesh. Shapes can be easily imported from CAD files or constructed in the user-friendly front end, VSimComposer, and are rapidly meshed with the proprietary VMesh algorithm. The advanced graphics capability displays detailed field data. VSimEM models EM propagation and dispersion and can compute radar cross sections and specific absorption rate (SAR). Switch easily between 2 dimensions for initial guiding simulations and 3 dimensions for accurate results.

VSim for Electromagnetics can be used in the design cycle for electromagnetic, electrostatic, and magnetic devices. Compute near-field and far-field radiation patterns from antennas, including patch antennas, horn antennas, parabolic antennas, and phased array antennas. Simulate radar interactions, including ground penetrating radar, with the total-field/scattered-field method. Model propagation in photonic crystals and other optical devices as well as in waveguides. Compute oscillations and Q-factors in resonators and cavities. Compute the electrostatic field from multiple biased shapes in the presence of dielectric materials and/or the magnetic field produced by coils in the presence of geometric objects made of magnetic materials.

With VSim for Electromagnetics you can easily obtain the desired engineering output from your simulation and quickly determine the validity of your model for use in the design of a device. Various output types, such as S-parameters and antenna gain, are simple to achieve with VSim for Electromagnetics. Simulations with different materials are easily set up. VSim for Electromagnetics comes with a rich set of examples to help you get started.

No matter your electromagnetic, electrostatic, or magnetostatic modeling requirements, from antenna design to photonics to semiconductors to iron-core magnets, VSim for Electromagnetics is the economical simulation tool with an easy learning curve that will decrease your time from design to device manufacture. VSimEM easily installs and runs on Windows, Mac OS X, and Linux platforms.



Geometry and Materials
  • Arbitary geometries with easy construction of complex structures
  • Choose from a variety of pre-defined material types such as copper and niobium or define custom materials
  • Lossfree and lossy, nonlinear, isotropic and anisotropic dielectrics
  • Second-order dispersive dielectrics
  • Excitation with port modes, discrete elements, discrete face ports, as well as plane waves and elliptical polarization
  • Frequency-domain and time-domain
  • Full field/scattered field
  • Adjustable Cerenkov noise filter
  • Periodic and phase-shifted boundary conditions
  • Perfectly Matched Layer (PML) boundaries
  • Matched Absorbing Layers (MAL) boundaries
  • Embedded boundaries for accurate metallic walls
  • Port boundaries: ingoing and outgoing
  • Dey-Mittra cut-cell algorithm
Data Analysis
  • Fastest and most accurate Far field calculations provided by our unique Kirchhoff Box algorithm
  • Radiated-field calculations--directivity, gain, beam width, side-lobe levels, axial ratio
  • S-parameters: single-ended, differential, de-embedded, renormalized
  • Mode calculations using frequency extraction

Advanced Features

  • Variable mesh in all coordinate systems grid conforming to custom geometry
  • Specific absorption rate (SAR) calculations
  • Linear plasma dielectric
  • Easily parameterized geometries for parameter sweeping and optimization.


  • Powerful post-processing capabilities
  • Economical:  Use VSimEM as a standalone simulation tool or add advanced physics features as needed by including other VSim packages
  • Easy learning curve: Build your own simulations using built-in examples as a starting point
  • Scales to solve your largest problems. Accurate parallel decomposition for fast solutions

 Questions? Contact us















Example Simulations Included

These example problems that demonstrate complex geometry, dielectrics, scattering, and advanced analysis are included with VSim for Electromagnetics to jumpstart finding the solution to your problem.

Examples Using Visual Setup

Visual Setup Examples are ready to run and easy to use.  Running a Visual Setup Example and then customizing the settings for your own simulation is the fastest way to learn VSim.

Other EM

Examples Using Text Setup

Code your simulation, then run it.  Text Setup Examples demonstrate how to format a simulation input file using code syntax. If you like the level of control available through designing your simulation using VSim code blocks and Python, use a Text Setup file as the basis for your simulation project.

Other EM





VSim model of EM waves scattering off surfacing submarine
EM Waves Scattering Off of Surfacing Submarine

Wave scattering off of a surfacing submarine demonstrates the near-field capabilities of waves scattering off of a three-dimensional figure with a nearby dielectric.

VSim simulation of patch antenna far field

Patch Antenna Far Field

Calculate the far field radiation pattern for a patch antenna.

VSim 3D model of power absorption in dielectrics with human head in profile

Human Head Profile

Power absorption in dielectrics with complex geometry.

VSim predator drone model
Predator Drone

Far field radiation pattern from a point source on a predator drone demonstrates how antenna performance is affected by the local environment.


VSim simulation of horn antenna far field

Horn Antenna Far Field

Horn antennas are widely used at UHF and microwave frequencies because of their ability to focus a beam as this far field radiation pattern demonstrates.

VSim electrostatic charged spheres simulation

Electrostatic Charged Sphere

Two charged spheres, solved using electrostatics.

VSim simulation of dipole above conducting plane
Advanced Dipole Above Conducting Plane

Excellent verification problem for antenna simulations by comparing the far field patterns with analytic solutions.

VSim 3D model of human head in three quarters view with dipole antenna

Human Head Three Quarters View

A dipole antenna near the ear of a human head displays the complex scattering and absorption of electromagnetic radiation.

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