Abstrakt
This paper investigates the possibility of exciting high quality trapped
resonant modes on frequency selective surfaces consisting of identical
sub-wavelength metallic inclusions (symmetrically split rings) with no
structural asymmetry but exhibitting electrical asymmetry. The electrical
symmetry is broken by using different dielectric substrates. The existence
of such anti-symmetric trapped mode on geometrical symmetric structure is
demonstrated through numerical simulation. Numerical results suggest that
the high quality factor observed for these resonant modes is achieved via
weak coupling between the "trapped modes" and free space which enables the
excitation of these modes.
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