带有扼流槽结构的共形波导缝隙阵列天线研究

Conformal Waveguide Slot Array Antenna With Choke Groove

设计了一款与圆柱面共形的宽边纵缝波导缝隙阵列天线,波导间采用扼流槽结构设计,抑制了表面波的影响、提高了天线增益。仿真结果表明:优化后的扼流槽结构可使共形阵列天线中间波导的互耦系数减小4.4 dB,两侧波导间的互耦系数减小3.6 dB;扼流槽结构参与了阵列天线微波辐射,提高了阵列天线的方向性;阵列天线的增益达23.3 dB,口径辐射效率达67.5%。实验结果表明,共形波导缝隙阵列天线实测增益达22.1 dB(含功分网络损耗1.1 dB),实测天线口径辐射效率达66.0%,功率容量达1.1 GW。实验结果与仿真结果基本吻合。

To suppress the influence of surface waves and improve the antenna gain,a wide-sided longitudinal waveguide slot array antenna conformal with a cylindrical surface is designed.The conformal waveguide slot array antenna is designed with a choke groove structure.The simulation results show that the optimized choke groove can reduce the mutual coupling coefficient of the middle waveguide of the conformal array antenna by 4.4 dB and the mutual coupling coefficient of the waveguide on both sides by 3.6 dB.The choke groove structure participates in the microwave radiation of the array antenna,which improves the directionality of the array antenna,the gain of the array antenna reaches 23.3 dB,and the aperture radiation efficiency reaches 67.5%.The experimental results show that the measured gain of the conformal waveguide slot array antenna reaches 22.1 dB(including the power division network loss of 1.1 dB),the measured antenna aperture radiation efficiency reaches 66.0%,and the antenna power capacity reaches 1.1 GW.The experimental results are in good agreement with the simulation results.