加载SIW腔的毫米波高相位一致性天线阵研究

High phase consistency for millimeter wave antenna array loaded with SIW cavity

波达方向估计中,其测向精度依赖于阵列中阵元间的相位一致性,因此设计了一款高相位一致性的毫米波四元直线阵。天线印刷在单层介质板上,采用同轴探针对顶层贴片进行差分馈电。首先采用耦合馈电方式,减小同轴馈电端口之间的耦合,从而减小每个阵元在远场的相位波动;其次,利用基片集成波导技术减小阵元间的相互影响,以提高阵列的相位一致性。仿真结果显示,阵列的|Sdd11|<-10 dB带宽为22.9~25.1 GHz,每个阵元在工作频带内的最大增益与隔离度分别大于6.5 dBi和16.2 dB,阵列在23 GHz、24 GHz处的E面、H面和±45°面上的相位一致性均保持在±10°内。对天线进行了加工和测试,实验与仿真结果较为吻合。

In the direction of arrival(DOA)estimation,the direction finding accuracy depends on the phase consistency between the array elements in the array,so a millimeter-wave four-element linear array with high phase consistency is designed.The antenna is printed on a single-layer substrate,and coaxial probes are used to differentially feed the top patch.Firstly,the coupled feeding method is used to reduce the coupling between the coaxial feeding ports,so as to reduce the phase fluctuation of each array element in the far field.Secondly,the substrate integrated waveguide(SIW)technique is used to reduce the interactions between the array elements and to improve the phase consistency of the array.The simulation results show that the|Sdd11|<-10 dB bandwidth of the linear array is 22.9~25.1 GHz,the maximum gain and isolation of each element in this working band are more than 6.5 dBi and 16.2 dB,respectively.The phase consistency of this array at 23 GHz and 24 GHz in the E-plane,H-plane and±45°-plane are within±10°.The antenna is processed and tested,and the experimental and simulation results are in good agreement.