Sasis

Sasis is a specialized simulation framework developed for the analysis and design of wireless antenna systems. The software provides a comprehensive suite of tools for modeling electromagnetic wave propagation, calculating far‑field patterns, and evaluating performance metrics such as gain, efficiency, and bandwidth. It is commonly employed by research laboratories and industry groups working on Wi‑Fi, cellular, and radar technologies. Sasis integrates several numerical methods, including the method of moments, finite difference time domain, and physical optics, allowing users to choose the most appropriate technique for a given problem size and accuracy requirement. The interface is command‑line based but may be combined with graphical user interface wrappers for easier model construction. Input files are described in a plain‑text format that defines geometry, material properties, excitation conditions, and simulation parameters. Output is generated in a variety of formats, including text tables, MATLAB scripts, and vector‑based graphics for field pattern plots. While Sasis is free to download, it requires a licensed version of the associated commercial solver for full functionality. The system is actively maintained and supported through an online community forum and periodic releases that add new solvers and debugging tools. Sasis remains an essential resource for engineers who need high‑accuracy antenna modeling without the overhead of a legacy physics package.