3D printed FSS arrays for long wavelength applications

The transmission properties of arrays of triple cross and caltrop FSS elements whose cores have been fabricated using two different three dimensional (3D) printing procedures is assessed. Having four symmetrically located arms, both elements are good candidates for testing the performance of 3D printed frequency selective structures. They allow for placement on different types of lattices including crystal-like configurations. The caltrop, when on a compact triangular lattice, offers good angular stability. The structures in this paper are designed to operate at the long wavelengths employed in wireless communications and are intended to control electromagnetic wave propagation in buildings. The basic performance of the arrays are summarized through simulations and experimental results.