一种宽带高隔离低成本的毫米波天线阵列单元的设计

Design of a Broadband High-isolation and Low-cost Millimeter-wave Antenna Array Unit

设计了一种适合于工程应用的宽带高隔离度的低成本毫米波阵列天线单元。该天线阵列单元将平面印刷天线与金属喇叭天线相结合,利用基片集成波导背腔贴片天线对简化的金属喇叭天线进行馈电,通过多个谐振模式的设计有效展宽该天线单元的工作带宽。该天线单元的优势是可以与后端射频链路一体化加工与实现,成本较低,同时保证了阵列天线单元间的高隔离度。电磁仿真和实际测试结果表明,在77 GHz~84 GHz的工作带宽内,该天线单元具有良好的阻抗匹配特性和稳定的辐射方向图,单元间隔离度优于-30 dB,具有较大的实际应用价值。

A broadband high-isolation and low-cost millimeter-wave antenna array unit,which is suitable for engineering applications,is proposed in this paper.The proposed antenna array unit combined the advantages of both the planar substrate integrated waveguide(SIW)antenna and the metal horn antenna,taking the cavity-baked SIW patch antenna as the primary feed of simplified horn antenna,introducing several resonance structures to improve the bandwidth performance.The advantages of the proposed antenna include fabricated-friendly,low-cost in fabrication,and the high isolation between different units.Both simulated and measured results show that the antenna array unit has good matching and radiation characteristics,isolation between different units is better than-30 dB during the working frequency band between 77 GHz to 84 GHz,making the antenna array unit a potential choice for millimeter-wave applications.