SRRs are constructed as two square-shaped rings, each interrupted by a small gap, as shown in Fig. 1. Embedding small single split resonator elements on a dielectric substrate we obtain negative magnetic permeability for a metamaterials-based
rectangular waveguide to perform a stopband in the certain frequency band. The
dielectric slab is then transversely inserted in a metallic waveguide, thus changing its electromagnetic properties to support backward wave and introduce phase advance for the metamaterials-based waveguide. The dielectric substrate which is used to build a slab is Rogers Duroid/RT5880, with permittivity Îµ; r = 2.2 and thickness t = 0.508 mm. The waveguide was designed to operate at Ka-band.
In order to investigate performance of the SRR metamaterials-based rectangular
waveguide a one-resonator-unit structure was simulated at Ka-band (waveguide WG-22, section 7.112 x 3.556 mm). Metamaterial slab is realized as a copper SRR printed on top of the dielectric substrate. Copper metallizations thickness of the printed pattern is 17 Î¼m. The slab is placed in the middle of the rectangular waveguide.