Today’s space and terrestrial communication infrastructure demands reduced size and weight components with high flexibility and low cost. We, at MinWave, produce miniaturized 3D printed waveguide passive devices for C band to Ka-band, 5 to 10 times smaller than conventional components depending on the working frequency. By employing a novel technique based on metallic metamaterials, we provide a significantly reduced size and weight as well as good or better RF performance than conventionally manufactured systems.