A Dual-Band Composite Right/Left-Handed SIW Metamaterial Unit Cell for mmWave Communications

The proposed paper presents a dual-band planar composite right/left-handed (CRLH) SIW metamaterial unit cell intended for mm-wave antenna applications. The suggested metamaterial unit cell can be used for frequency scanning-based backward-to-forward beam-steering capabilities. The proposed metamaterial structure has been constructed by engraving interdigital slots on the SIW upper and the lower surface, which gives rise to two left-handed (backward) and two right-handed (forward) passbands alternatingly that accommodate dual CRLH operating frequency bands in the radiating region for the frequency greater than 27.5 GHz.