3D printed Alumina filters for Q band space telecommunication

This work studies a surface mountable ceramic bandpass filter for Q band application. A 4
^th
order Chebyshev filter is designed to have an operating frequency of 40 GHz while optimizing a tradeoff between performances, surface mounting capability and size. Ceramic SLA printing was used to fabricate a specifically designed 3D shape that allows the wire bonding of this filter on a PCB carrier. The filters tested here have been fabricated out of Alumina and attached to a frame in order to facilitate the required technological steps, i.e. full metallization and laser etching of their CPW accesses. The measured results of six filters made within a same batch show a good reproducibility of their measured S-parameters and are in line with the expected performances.