In the previous post in this series, I introduced Fest3D, a tool for synthesizing and optimizing filters and waveguide components. In this post, I will demonstrate the Fest3D workflow for building a model of an interdigital filter and tuning it.

In the first video, I show how a filter can be quickly modeled in Fest3D. The user builds the filter out of individual components by dragging blocks into a schematic, specifying their parameters, and connecting them. Once the filter layout is created, Fest3D can immediately calculate the filter response.

Once we have a model, we now need to tune it. This next video shows how the user can specify the desired filter response, and tune it using Fest3D. The optimizers in Fest3D adjust the filter parameters to meet the specifications. The filter is tuned in a matter of minutes.

When users are designing filters from scratch rather than tuning existing models, the workflow is even more straightforward. In the next posts, I will show the Fest3D wizards for setting up and synthesizing many different types of filters.