Plane-wave illumination of concentric-ring frequency-selective surfaces

摘要: In the paper we present results of a modal analysis current distribution around circumference thin concentric rings arranged on both square and equilateral triangular lattices. The particular case plane-wave illumination at 45° incidence is considered owing to its relevance oblique-incidence diplexer systems. Measured predicted transmission curves, together with computer curves illustrating frequency dependence various current-mode amplitudes, are plotted for selected concentric-ring structures, each same mean radius outer ring, but different inner-ring radii. relate individual modes features in observed curves. They confirm that copolar lower reflection bands can be modelled only one mode ring. Crosspolar effects discussed lattice planes o = 0, 90°, where they shown small pure TE TM.