Monolithic FDM 3-D Printed Waveguide Filters

In this paper, the design and realization of X-band monolithic 3-D printed waveguide filters is discussed. All proposed filters are manufactured with the low-cost fused deposition modeling (FDM) additive manufacturing technique, due to the wide distribution of this printing technology in laboratories and industry. Two combined waveguide components are proposed: The first component is a combination of a twist and a third order filter while the second one combines a fourth order filter with two frequency dependent couplings, a twist and a corner. All components are manufactured with the FDM printing technique and the results are compared with the simulation. Additionally, the metal plating procedure is shortly addressed.