一种低剖面低RCS磁电偶极子天线阵列的设计

The design of a low profile and low RCS magneto-electric dipole antenna array

设计了一种低剖面宽带低RCS磁电偶极子阵列。从辐射散射联合特性的角度研究天线单元的谐振特性,构造出具有相同辐射性能、对交叉极化来波反射相位接近反相的两种不同单元。在主极化方向采用同一单元和SIW差分馈电构造宽带匹配的子阵,带内良好匹配实现对主极化波的低散射;再通过将子阵镜像布阵实现对于交叉极化来波的散射相消,从而有效缩减天线RCS。该天线工作频带为26.77~34.35 GHz(24.8%),峰值增益为17.7 dBi。与采用同一类型单元的参考阵列对比,所提磁电偶极子阵列在22.5~34.5 GHz范围实现了-10 dB交叉极化RCS缩减,并且辐射频带内没有明显的增益损失。

A low-profile,wideband,low Radar Cross Section(RCS)magneto-electric dipole array antenna is designed in this paper.The resonant characteristics of the antenna unit are studied from the perspective of radiation and scattering coupling,resulting in the construction of two different units with similar radiation performance but nearly opposite phase reflections for the cross-polarized incident waves.A wideband-matched sub-array with low scattering for the main polarized wave is formed by using the same unit and SIW differential feeding in the main polarization direction.Subsequently,the scattering phase cancellation for the cross-polarized incident waves is achieved by deploying the sub-array in a mirrored configuration,effectively reducing the RCS of the antenna. The antenna operates in the frequency range of 26.77 GHz to 34.35 GHz (24.8%) with a peak gain of 17.7 dBi. Compared with the reference array using the same type of unit, the proposed magnetoelectric dipole array achieves a reduction of -10 dB in cross-polarization RCS from 22.5 GHz to 34.5 GHz, without significant gain loss within the radiation band.