Bandpass Filter Based on Skeleton-like Monobloc Dielectric Pucks Made by Additive Manufacturing

This paper presents a 6
^th
order quasi-elliptic bandpass filter working at 11.75 GHz and based on dielectric hollow resonators (pucks). The resonators and their supporting elements have been fabricated altogether in a single part using ceramic (Alumina) additive manufacturing. This part is simply placed in the filter metal housing and therefore limits the number of pieces to be assembled. An important aspect of this work is that no specific, and potentially lossy, third materials (supports, glue) are needed. This assembly route easily allows the dielectric resonators to be placed in the middle of their cavities in order to maximize their Q factor. The proposed principle has been experimentally validated using, for the fast prototyping of this proof of concept, metallized and low cost plastic 3D printing.