(a) Layout of the dual-band impedance inverter based on a combination of series connected OSRRs in the external stages and a pair of shunt-connected OCSRRs in the central stage; (b) circuit and electromagnetic simulation. The substrate is the Rogers RO3010 with thickness  mm and dielectric constant = 10.2. Dimensions are . For the open complementary split ring resonator, and . For the open split ring resonators, and . The wide metallic strip in the back substrate side has been added in order to enhance the shunt capacitance of the open complementary split ring resonator stage, as required to achieve the electrical characteristics of the device. From [16]; copyright © 2009 IEEE, reprinted with permission.