Conjugated bi-layer C8 metamaterials are proposed. Chirality and refractive index can be controlled effectively by the structure geometry. Extreme chirality results in a high negative refractive index for both right- and left-circular polarized excitations. The conjugated bi-layer C8 structures are fabricated and tested in microwave regimes. The measurement results are in good agreement with the simulation results. These proposed structures are additional promising candidates for high negative refractive index metamaterials which will facilitate different applications.

Circular polarized microstrip antenna with chiral metamaterial polarizer is proposed. Circular polarized patch antenna with fine axial ratio is first designed. Chiral metamaterials are then used as a polarizer in order to filter out an undesired radiating wave in front of the circular polarized patch antenna. It has been proved that the axial ratio, transmitted bandwidth and the return loss of a metapolarized antenna are enhanced compared to previous designs.

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