In-Band RCS Reduction of Microstrip Antenna Using Characteristic Mode Analysis

This work proposes a low radar cross section (RCS) microstrip antenna with characteristic mode analysis (CMA). The scattering modes can be distinguished by Modal Weighting Coefficients (MWC). Several slots are placed at optimal positions on the antenna to suppress the scattering modes while keep the radiation modes unaffected. Simulated results show that the proposed antenna achieves at least 12.4 dB reductions over the operation band for y-polarization wave incidence.