Frequency selective surfaces formed by partially metalising 3D printed shapes

The use of additive manufacturing (AM) techniques for the development of 3D frequency selective structures is discussed. The type of structures introduced use 3D printing to form the shape of the elements which are then coated with conductive paint. Fully and partially metalised array elements are studied. Fully metalised elements offer mechanically robust structures as well as reliability in the transmission responses. By controlling current paths, partially metalised structures can offer lower frequency operation and stability to angle of wave incidence. They are also a more efficient use of conductive material. The element dimensions suit the long wavelengths employed in wireless communications and assist in controlling electromagnetic wave propagation in buildings.