RCS Reduction of Microstrip Antenna Based on Characteristic Mode Analysis

Abstract

In this paper, microstrip antenna is analyzed using the theory of characteristic modes (TCMs). Modal weighting coefficient (MWC) under the excitation of plane wave are further calculated. Additional slots are introduced to lower the resonant frequency of scattering modes, which results in smaller modal weighting coefficient in the operation frequency band. Monostatic RCS of the microstrip antenna have a certain degree of reduction.