Abstract
In this paper, an application of additive manufacturing technologies for realization of multilayer microwave circuits in microstrip transmission line technique is presented for the first time. An example of a second-order cascaded loops directional filter allowing to separate 2100 MHz LTE band was designed in suspended microstrip with three metal layers, manufactured using a combination of PolyJet 3D printing with UV cured VeroWhitePlus polymer material and magnetron sputtering of copper, and assembled out of two parts using a lego-like process. The obtained results for the manufactured circuit confirmed that the proposed approach is of potential use for circuits and systems operating within the microwave frequency range.
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