Left handed behavior of SRR filled waveguides

This paper reports the left handed behavior of a novel transmission structure in waveguide technology taking benefit of a negative permeability synthesized via split ring resonators (SRRs). To overcome the existing limitations in terms of matching of previously reported sub-wavelength SRR-loaded metallic waveguides, we propose a structure based on its combination with inductively coupled cavities modeling a double negative media. Numerical evidence of the left handed behavior of this new guiding system is achieved by: (i) effective permittivity and permeability extraction and analysis; (ii) analysis of the frequency dependence of the phase offset between two different length transmission lines; and (iii) analysis of the composite media in terms of equivalent circuit parameters. A parametric study on the geometry of such structures demonstrates the possibility of tuning different electrical parameters as well as the composite effective media engineering.