基于超材料的低剖面宽带双极化天线设计

Design of Metamaterial-Based Low-Profile Broadband Dual-Polarized Antenna

设计了一种基于超材料的低剖面宽带双极化天线;该天线采用复合左右手结构(CRLH)作为辐射单元,利用其色散曲线的非线性的特点,实现两种模式谐振点的融合,拓展带宽;同时采用不连通的十字形缝隙改善异极化隔离与交叉极化;阐述了以复合左右手结构作为天线辐射单元的宽带低剖面天线的工作原理以及复合左右手结构色散图的绘制方法;论述了宽带低剖面线极化天线、水平/垂直双极化天线、±45°双极化天线的设计方法,并给出了HFSS的仿真结果;仿真结果表明:该天线具有小型化、低剖面、宽频带的特点,可用作大型天线阵的阵元。

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 operating principle of the low profile wideband antennas using CRLH structure as radiation unit and the method to draw the dispersion diagram of the CRLH structure are proposed.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.