Abstract: The present invention relates to a method for producing a shell for a Luneberg lens in which an amount of a dielectric material composition containing particles of an expandable plastic material coated with an amount of a titanium-oxygen compound, is introduced into a mould and heated to an appropriate temperature for moulding. As a plastic material use is made of an expandable plastic material which is non-expanded or partly pre-expanded. The moulding temperature is selected such that expansion of the particles takes place. As an expandable plastic material preferably use is made of polystyrene. The dielectric moulding composition preferably comprises 5-65 wt. % of the titanium-oxygen compound with respect to the total weight of the composition.