openEMS

openEMS is a free and open electromagnetic field solver using the FDTD method. Matlab or Octave and Python are used as an easy and flexible scripting interface. See more

Installation

Windows

Download the latest windows build with the “msvc” label

Extract the files of the downloaded zip folder in a folder, let us extract it to:

C:\openEMS

Module requirements

Some python modules are required to run openEMS simulations and tutorials: numpy, h5py, matplotlib and cython:

pip install numpy h5py matplotlib cython

Install pre-build modules

For some python versions, pre-build wheel files can be found in the python sub-directory. E.g. for python 3.14 (using pip):

cd C:\openEMS\python
pip install csxcad-0.6.3-cp314-cp314-win_amd64.whl
pip install openems-0.0.36-cp314-cp314-win_amd64.whl

Setup

Python needs to find the dependent libraries (dll’s) during module import. To allow this, it is necessary to set an environment variable (permantently, terminal restart my be necessary):

setx OPENEMS_INSTALL_PATH C:\openEMS