Fest3D is a software tool capable of analyzing complex passive microwave components based on waveguide and coaxial cavity technology in very short computational times with high accuracy compared to mode-matching methods. This suite offers all the capabilities needed for the design of passive components such as optimization and tolerance analysis. Moreover, Fest3D advanced synthesis tools can be used to design bandpass, dual-mode and lowpass filters from user specifications.

Fest3D is based on the integral equation technique efficiently solved by the Method of Moments. Additionally, the Boundary Integral-Resonant Mode Expansion (BI-RME) method is employed for extracting the modal chart of complex waveguides with arbitrary cross-section. The successful combination of such methods ensures a high degree of accuracy and a reduction in the computational resources required (in terms of CPU time and memory).

Fest3D is an optional part of CST Studio Suite and is also available as a stand-alone offering.