  Additive manufacturing paves new ways to an efficient exploration of the
third space dimension, providing advantages over conventional planar
architectures. In particular, volumetric electromagnetic antennas can
demonstrate superior characteristics, outperforming their planar counterparts.
Here a new approach to the fabrication of electromagnetic devices is developed
and applied to antennas, implemented on curved surfaces. Highly directive and
broadband antennas were 3D-printed on hemispherical supports. The antenna
skeleton and the support were simultaneously printed with different polymer
materials - PLA mixed with graphene flakes and pure PLA, respectfully. Weakly
DC-conductive graphene PLA-based skeleton was post-processed and high-quality
conductive copper layer was selectively electrochemically deposited on it. The
antenna devices were found to demonstrate radiation performance, similar to
that achievable with conventional fabrication approaches. However, additive
manufacturing of RF antennas provides superior capabilities of constructing
tailor-made devices with properties, pre-defined by non-standardized end users.
