Design of Compact and High Isolation Dual-Polarized Antenna Array via Plasmonic Meta-Structure
Zhang Wen Cheng, Shimeng Wang, Yue Teng Chen, Ji Ran Chen, Jing Cheng Liang, Feng Gao, Shuai Luan, Xin Liu, Hui Feng, Tie Jun Cui
Abstract
We propose a compact and high isolation dual-polarized antenna array based on plasmonic metastructure operating at 2.58 GHz. The compact principle of the dual-polarized antenna is mainly based on spoof surface plasmon polariton (SSPP) radiation patch to support SSPP modes, which is fed by spatially coupled excitation. Due to the slow-wave feature of SSPPs, the size of dual-polarized radiation patch is reduced to 0.2λ0×0.2λ0, and the total antenna size is reduced to 0.39λ0×0.39λ0, which is much smaller than that of the traditional microstrip antenna with 0.5λ0×0.5λ0. The cross-polarization coupling between two polarization ports can be improved to below -32 dB, showing high isolation characteristics. Besides, a 3×3 compact antenna array is also designed, fabricated, and measured to verify the feasibility of its extension to largerscale antenna systems. Both simulated and measured results of the proposed compact antenna and the antenna array illustrate compact profiles, good ±45° radiation performance, and high isolation levels, which have potential application values for the massive multiple-input and multiple-output (MIMO) base stations.