Additive Manufacturing Processes in Ceramic and Metal for the Fabrication of RF Filters

The continuous improvement of additive manufacturing (AM) technologies facilitates and stimulates also the RF community. In particular, the design and manufacture of typical passive components like RF filters underwent a change with the new possibilities of rapid prototyping, the implementation of new forms and geometries, right up to the use of novel materials. However, each of the different AM-technologies and the applied materials introduce certain constraints. This presentation will focus on the process categories lithography-based manufacturing and selective laser melting and the materials ceramics and metals and will show examples of different stages of the RF filter development and fabrication. Also the influence of certain pre- and post-processing steps like machine process optimization, sintering, and post-processing treatments to reduce the surface roughness will be discussed, thus, addressing also the practical aspects of the fabrication process.