Artificial magnetic conductors based on capacitive gratings

Abstract

New realizations of artificial magnetic conductors (AMCs) based on two or more closely spaced capacitive gratings whose period is small relative to the wavelength are proposed. Simple formulas are derived for estimation of the resonance frequencies and frequency bands in which the proposed structures behave as AMCs. Angular dependencies of the resonance frequencies are found for TE and TM waves. Propagation conditions for surface waves are considered. It is shown that, at resonance frequencies, such structures support only slow TM waves with small values of the slowing factor. It is confirmed experimentally that such structures behave as AMCs in a wide interval of the angles of incidence of TE and TM waves.