The excellent dielectric values of ROHACELL are a major advantage for its use in radomes and antenna engineering.

The moisture pick-up of ROHACELL without skins does not really influence the remarkable specific properties of ROHACELL in antenna applications since the water molecules are fixed in the imide groups and are unable to oscillate freely.

When ROHACELL is covered with skins as usual, the skin material influences the properties of the antenna more than ROHACELL itself. The change of the antenna properties by water absorption of the skins must also be taken into account as the water molecules may oscillate freely here.