新型双圆极化单脉冲天线

摘要

A novel dual circular monopulse antenna based on the microstrip slot couple is presented.The operation band of the monopulse antenna is 2.2 GHz.First,we design a 2 ×2 dual circular polarized array. By rotating the radiation elements,the cross polarization will be suppressed.Second,according to the char-acteristics of monopulse antenna,we design a 4 ×4 dual circular polarized array.For suppressing the cross polarization,the feeding network is rotated too.The simulation results show that the cross polarization is-65 dB.At last,according to the initial phase of the whole array,a monopulse comparator for left-hand and right-hand circular polarization is designed by use of the 3 dB hybrid couplers.The measurement results well agree with the simulation results.The measured gain of the sum pattern is 1 9.78 dBi.%介绍了一种新型基于微带缝隙耦合的双圆极化单脉冲天线。天线工作在2.2 GHz,首先设计了2×2双圆极化阵列,并且通过对每个辐射单元旋转实现对交叉极化的抑制。再次,根据单脉冲天线特性设计了4×4阵列,同样为了抑制交叉极化,对馈电网络按照一定顺序进行了旋转,仿真结果表明交叉极化达到-65 dB。最后根据整个阵列4个辐射象限的初始相位值,利用3分支电桥,设计了适合左旋和右旋圆极化“十”字形和差网络。经过实测,仿真结果与测试结果吻合较好,天线和波束增益为19.78 dBi。