Patch antenna with stacked split-ring resonators as an artificial magneto-dielectric substrate

Densely packed arrays of split-ring resonators (SRRs) are used as an artificial magneto-dielectric substrate to reduce the resonant frequency of a lambda/2 patch antenna. The SRR stacks (also called metasolenoids) embedded into dielectric medium constitute an anisotropic magnetodielectric substrate, thus allowing a considerable reduction of the resonant frequency of the antenna. The effects of the magneto-dielectric substrates on impedance bandwidth are studied numerically and experimentally. We experimentally demonstrate a wider impedance band for an antenna with stocked SRRs embedded in a low-permittivity substrate, as compared with one in a higher-permittivity substrate without SRRs. (c) 2005 Wiley Periodicals, Inc.