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In this paper, an ultrathin asymmetric chiral metamaterial multi-band circular polarizer using combined twisted double-gap split-ring resonators (DGSRRs) is proposed and investigated. Experiment and numerical simulations are in good agreement, indicating that when a y-polarized wave is incident on this chiral metamaterial propagating along iz direction, the right circularly polarized (RCP) wave is emitted at 5.58GHz and 9.34GHz, while left circularly polarized (LCP) wave is excited at 6.41GHz and 7.65GHz, in addition to large polarization extinction ratio of more than 18dB at the four resonant frequencies. The surface current distributions are studied to illustrate the transformation behavior for both circular polarizations.

ASYMMETRIC CHIRAL METAMATERIAL MULTI-BAND CIRCULAR POLARIZER BASED ON COMBINED TWISTED DOUBLE-GAP SPLIT-RING RESONATORS