低RCS EBG波导缝隙阵列天线

EBG waveguide slot array with RCS reduction

将Mushroom电磁带隙结构(Electromagnetic Band Gap,EBG)的表面波带隙和同相反射特性同时用于波导缝隙阵列天线的设计,利用EBG的带隙特性抑制天线阵中的表面波,以改善天线的辐射性能;利用EBG的同相反射特性实现天线雷达散射截面(Radar Cross Section,RCS)的减缩,天线综合性能得到较大提升。制作了EBG波导缝隙天线阵样品,并对天线阵的阵元互耦、辐射方向图及天线阵RCS等指标进行了测试,结果与理论预期相吻合,有效地降低了阵元间互耦及天线阵RCS。

Mushroom electromagnetic handgap structure shows surface-wave bandgap and in-phase reflection, these two characteristics were simultaneously used for designing the waveguide slot array antenna. The surface-wave bandgap was used to suppress the surface-wave in antennas and arrays, which results in radiation performance improvement. In addition, the in-phase reflection could be used to reduce the RCS level of antennas and arrays, so as to improve their total performances. A sample of four-element EBG waveguide slot array antenna was made, and the indexes of mutual coupling, radiation pattern and RCS of the sample were tested. The result is similar with the theoretical expectation, which has effectively reduced the mutual coupling and the RCS level of antennas and arrays.