openEMS
Thorsten Liebig and contributors
Download from the vendor
docs.openems.de
An electromagnetic field solver using the finite-difference time-domain (FDTD) method. You define geometry, materials and excitation in an Octave, MATLAB or Python script and get S-parameters, input impedance, radiation patterns and field distributions. It is used to design antennas, microwave filters, transmission lines and structures on printed circuit boards. A strong free alternative to commercial solvers, but there is no full graphical interface for building the model — the work is done in code, and large models take considerable run time.
Ratings & Reviews
| Licence type | Completely Free, Open Source |
|---|---|
| Licence terms | Open-source licence (GPL-3.0). Free for any purpose including commercial work, with no time limit, no registration and no licence key. Windows has ready binaries; on Linux it is built from source and on macOS installed through Homebrew. |
| Platforms | Linux, macOS, Windows |
| Engineering field | Electrical & Electronics |
| Tool type | Simulation & FEA |
| Vendor site | www.openems.de |
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Last verified: 2026-10-05
