Abstract
A novel model is proposed to analyze the scattering of antenna by which the scattering of antenna with arbitrary load is obtained conveniently and the antenna mode RCS together with the structural mode RCS are illustrated separately. The model is realized by the ANSOFT HFSS and some useful results are illustrated. The structural mode RCS and antenna mode RCS are compared with the results by other methods, which proves the model correct and efficient. The results are meaningful for the antenna RCS prediction and reduction.