Topology (a), photograph (b), and frequency response (c) for the designed fifth-order filter implemented by means of OSRRs and OCSRRs. The substrate is the Rogers RO3010 with thickness and measured dielectric constant . Dimensions are and . For the external OSRRs: , and . For the central OSRR: ,0.4, and . For the OCSRRs: . The element values that have been used in reference of Figures 20 and 21 are for the external OSRRs: , and ; for the central OSRR: , and ; for the OCSRRs: , and . From [19]; copyright © 2011 IEEE; reprinted with permission.