VsimEM Electromagnetic Simulation of a Crab Cavity
Crab Cavity of modes and frequencies of an accelerator cavity in a given frequency range

VSimEM For Electromagnetic & Electrostatic Simulations

Looking for electromagnetic simulation software? VSimEM is an optimized FDTD solver used for simulating electromagnetic, and electrostatics in complex dielectric and metallic environments. Users of VSimEM can import existing CAD files or build their own unique geometries through the user interface, with numerous options for domain features and boundary conditions. In VSimEM, curved geometric structures are simulated by using second-order accurate algorithms, and advanced graphics capabilities display detailed field data for in-depth analysis.

VSimEM can be used for applications including phased array antenna systems, radar equipment, and photonics. With VSimEM, users can simulate high power antennas in plasma environments, or efficiently model propagation in photonic crystals and other optical devices. VSimEM is capable of running challenging problems at scale and designed to take advantage of any computing system due to parallel processing, making VSimEM the optimal solution for complex electromagnetics and electrostatics.

See how engineers and researchers are using VSimEm: VSimEM Publications

Learn how VSim was used by the scientists at Fermilab National Laboratory to discover machining errors in their superconducting RF crab cavity.

“At LANL, we have several modeling needs ranging from calculating far-field antenna patterns to the gain of dielectric traveling-wave tubes. These are complex problems and we were unable to set up accurate models with the previous numerical tools we were using. After seeing Tech-X’s result at a conference, we decided to try it. We have been very impressed with its broad capabilities, intuitive feel, and ease of use. It’s a great code and we anticipate using it for all of our future needs.”

Bruce Carlsten
Los Alamos National Laboratory

VSimEM Advantages

Electromagnetic Simulation Software Example: Dipole
VSimEM EM Physics Simulation of 2.4 GHz Yagi Uda Antennas electric field near-field pattern.
Screen capture of Yagi Uda Antenna, The Electric Field Near-Field Pattern With VSimEM.

VSimEM Capabilities

Geometry and Materials
  • CAD Importability
  • Easy construction through the user interface
  • Customizable Materials
  • Lossless & Lossy
  • Nonlinear
  • Isotropic & Anisotropic
  • Second-Order Dispersive
  • Frequency-Dependent Dielectrics
  • Mode Calculation & Launching
  • Discrete Elements & Face Ports
  • Plane Waves & Elliptical Polarization
  • Excitation for Scattering Calculations
  • Waveguide Ports
  • Embedded Boundaries for Accurate Metallic Walls
  • Port Boundaries: Ingoing & Outgoing
  • Periodic & Phase-Shift Conditions
  • Dey-Mittra Cut-Cell Algorithm for Tight Meshing
  • PML & MAL Boundaries
Data Analysis
  • Unique Kirchoff Box Algorithm for Fast & Accurate Far-Field Calculations
  • Radiated-field Calculations
  • S-Parameters Including Single-Ended, Differential, De-Embedded, & Renormalized
  • Mode Calculations Using Frequency Extraction
Advanced Features
  • Specific Absorption Rate Calculations
  • Linear Plasma Dielectric
  • Easily Parameterized Geometries for Parameter Sweeping & Optimization

Have a Complex Problem?

Applications for VSimEM


EM propagation and dispersion



Radar Cross-Sections


Specific Absorption Rate

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