FEST3D is able to efficiently analyse different type of passive microwave structures in waveguide technology. Basically, FEST3D is based on an integral equation technique combined with the Method of Moments. Additionally, the Boundary Integral-Resonant Mode Expansion (BI-RME) method is employed for extracting the modal chart of waveguides with non-canonical shapes. These methods ensure a high degree of accuracy as well as reduced computational resources (in terms of CPU time and memory).
On this basis, FEST3D is capable to simulate complex microwave devices in extremely short times (of the order of seconds or few minutes) whereas general purpose software (based on segmentation techniques such as finite elements or finite differences) can spend hours for the same calculation.
Furthermore, unlike mode-matching techniques, the electromagnetic algorithms employed in FEST3D minimize the problems of relative convergence leading to more confident results. Moreover, the integral equation technique extracts part of the frequency dependent computations, allowing a faster computational time per frequency point when compared to mode-matching techniques. This benefit is more evident when many modes are required for an accurate analysis of the component.