Mutual Coupling Reduction of a Circularly Polarized Four-Element Antenna Array Using Metamaterial Absorber for Unmanned Vehicles
Mutual Coupling Reduction of a Circularly Polarized Four-Element Antenna Array Using Metamaterial Absorber for Unmanned Vehicles
复制标题
无人驾驶车辆使用超材料吸波器的圆偏振四元件天线阵列的互耦合降低
DOI：
10.1109/access.2019.2913552
复制
发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Chen, Juan
中科院分区：
文献类型：
--
作者：
Zhang, Jun;Li, Jianxing;Chen, Juan
提出了一种双层超材料吸波材料来抑制工作在中国北斗导航卫星系统(BDS)B3频段的圆极化(CP)四单元天线阵中的互耦，其中四个小型化贴片天线单元以旋转对称的方式分布。单馈天线单元同时利用厚空气衬底来加宽可实现的CP带宽，利用四个寄生接地条来减小尺寸占用，并利用电容探头馈电来增强阻抗匹配。在四个CP天线单元之间引入了一层采用开槽十字贴片结构的双层超材料吸波器壁。实现了一个总占地面积为$0.81\lambda_{0}\，\，\次\，\，0.81\lambda_{0}$($\lambda_{0}$表示1268 MHz自由空间波长)的天线阵列原型，并进行了实验验证。测量结果与仿真结果吻合较好，表明在整个工作频段内，平行定向和正交定向天线单元对的互耦降低了11d B和8d B，同时也获得了良好的共振性能。文中给出了详细的设计考虑，并给出了仿真和测量结果。所提出的天线阵可以很好地适用于无人机中的BDS抗干扰天线应用。
A double-layer metamaterial absorber is proposed to suppress the mutual coupling within a circularly polarized (CP) four-element antenna array operating at the Chinese Beidou navigation satellite system (BDS) B3 band, wherein four miniaturized patch antenna elements are positioned in a rotationally symmetric distribution. The single-feed antenna element utilizes simultaneously a thick air substrate to widen the achievable CP bandwidth, four parasitic grounded strips to reduce the size occupation, and a capacitive probe feed to enhance the impedance matching. A wall of the double-layer metamaterial absorber using slotted cross patch structure is introduced in between the four CP antenna elements. An antenna array prototype with an overall footprint size of $0.81\lambda _{0}\,\,\times \,\, 0.81\lambda _{0} $ ( $\lambda _{0}$ denotes the free-space wavelength at 1268 MHz) is implemented and validated experimentally. The measured results in a good agreement with the simulated ones demonstrate a mutual coupling reduction of 11 and 8 dB, for the parallel-directed and orthogonal-directed antenna element pairs across the entire operation band, and meanwhile a good CP performance is also achieved. Details of the design considerations as well as the simulation and measurement results are presented and discussed. The proposed antenna array can be well suited for BDS anti-jam antenna applications in unmanned vehicles.