▎ 摘　　要

In this paper, the analysis and equivalent circuit of complementary graphene patch (CGP) cell are presented for the first time. The graphene patch cell, which is commonly used in the design of terahertz metasurfaces (specially antennas), suffers from several challenges, such as additional lines for DC connecting cells and their effects on the radiation patterns, the limited range of structure for supporting TM surface plasmonic polariton waves, the low confinement and quality factor of structure and impractically small synthesized dimensions. It is shown that the proposed CGP structure overcomes all these challenges. Then a novel 2D leaky wave antenna based on CGP unit cell is designed using the holographic antenna theory. The proposed structure is realized by a single bias voltage applied to the graphene sheet. Consequently, the radiation direction can be easily swept by tuning this bias voltage.