Quality factor of frequency selective surfaces at infrared

The Q factors in FSS based on finitely conducting metallic strips have been investigated. FSS with increasing periodicity of the strips have been found to exhibit lower terminal resistance, giving rise to stronger induced currents. In the presence of conductor losses, arrays with larger periodicity (i.e. less metallisation per unit area) exhibit stronger thermal absorption. The unloaded Q factor has been studied and it was demonstrated that due to the increase in the energy stored for strips separated further apart, the ratio of stored over dissipated power increases, despite the higher absorption.