文中以特征模理论为指导,通过天线修形方法实现了微带天线双线极化宽频带雷达散射截面(RCS)缩减设计。对天线的特征模式进行分析,根据模式权重系数选取主要散射模式,并利用辐射和散射模式电流的区别,在保证辐射性能前提下,通过天线修形技术抑制主要散射模式实现了微带天线的双线极化宽频带RCS缩减设计。仿真结果表明:与参考天线相比,低散射天线在0.5 GHz~2.7 GHz (137.5%)频带内实现了同极化和交叉极化RCS缩减,缩减峰值分别为13.0 dB和13.2 dB,且天线增益下降小于0.8 dB。该方法为宽带双线极化低散射天线研发提供了新的理论指导。

A wideband low radar cross section (RCS) design for dual-linear polarization incident wave is presented with shape modification on the basis of characteristic mode theory in this paper. The magnitude of the modal weighting coefficients (MWCs) of the antenna is analyzed, and the significant scattering modes can be determined by the MWC. The shape modification is carried out based on the difference of the modal currents between the radiation modes and scattering modes and the scattering modes are suppressed while keeping the radiation modes well. A wideband low RCS ring patch antenna is obtained for co-polarization and cross-polarization over the frequency band of 0.5 GHz~2.7 GHz (137.5%). Compared to the reference antenna, the peak RCS reduction of co-polarization and cross-polarization is 13.0 dB and 13.2 dB, respectively. The realized gain loss is lower than 0.8 dB. Therefore, the design provides a new theoretical guidance for the broadband dual-linear polarization low-RCS antenna research and development.

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