Special Materials

Jerusalem cross FSS

Synthetic material and periodic structures with special electromagnetic properties have a wide range of applications, for example

• Design of periodic structures to act as frequency selective surfaces (FSS)
• Antenna placement analysis on structures made of carbon fibre
• Analysing antennas that make use of metamaterials

FEKO provides a range of features to effectively simulate such problems:

• Periodic boundary conditions to analyse complex, periodically repeating structures
  
• Anisotropic material modelling to allow the specification of materials with different conductivity in orthogonal directions
• User specifiable material parameters enable metamaterial simulation

Periodic boundary condition unit cell		Metamaterial resonator

Example: Scattering by a carbon fibre plate

• 2 square plates, side by side, each 1 square wavelength in size

• both plates have conductivity = 4e4 S/m  (the same as fibres or carbon fibre)
• left plate is modelled as an anisotropic material (e.g. carbon fibre) with fibre conductivity vertically aligned
• a plane wave with vertical or horisontal polarisation is incident on the plates from a normal direction
  

Vertically polarized incident plane wave

Horizontally polarized incident plane wave