To form a substantially closed void between two structures on a substrate, a flowable liquid dielectric material is deposited to fill partially the space between the structures, and a surface is placed to bridge and substantially close the space between the structures. A plurality of surface antenna elements, each having a carrier surface material and a radiation coating applied thereon are connected by two spaced apart electrical conductors in parallel, with electrical contacts as antenna limiters and with which high-frequency electromagnetic radiation can be emitted. In the event that a terminal having the offset voltage and clamp current is accidentally coupled to the protected terminal, the offset voltage and clamp current may be applied to the protected terminal.