Reflected wave interference reduction device esp. for wideband aerial

摘要

The device includes a radiation absorbent layer (30) which is positioned between the aerial (10) and a radome (20), close to the aerial. This layer has an absorption factor which increases from the centre towards the outside. The layer offers low absorption to low frequency radiation from the periphery, but high absorption of the high radiating frequencies reflected from the radome. This can be achieved using an absorption layer with a central hole or by using several layers with increasing diameter holes stacked so the effective thickness increases away from the centre.