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A metamaterial-based low-profile broadband dual-polarized antenna is designed. Due to the non-linear characteristic of the dispersion diagram, it is easier for the proposed antenna to merge two adjacent resonance points which uses CRLH structure as radiation unit, leading to the enhancement of the bandwidth. The novel cross-shaped coupling slot has a positive contribution on the improvement of the performance of the isolation and cross polarization. The design principle and simulated results of the low-pro broadband antenna, the horizontal/vertical dual-polarized antenna, and the ±45°dual-polarized antenna are proposed. The simulated results show that low-profile and wideband characteristic of the antennas which can be used as the units of the phased array antennas.