Abstract: 　　
　　The RCS reduction of scattering grating lobe in wide-angle stealth is investigated, and the characteristic mode theory is used to the design of the conformal antenna. The scattering grating lobe reduction of the conformal array antenna is achieved by adjusting the scattering pattern of the cell. Firstly, the wide-angle domain characteristic analysis is carried out for the conformal cell. The main radiating and scattering characteristic modes are analyzed by modal weighting coefficient, modal currents and modal electric fields. The conformal cell is adjusted according to the current distribution of the main scattering modes. Compared with the reference antenna, the new cell realizes wide-angle domain’s scattering reduction by decreasing the scattering pattern amplitude without depraving the radiation performance of the array. The designed conformal array operates in the frequency band from 4.96 GHz to 6.78 GHz. The RCS reduction of the scattering grating lobe of x-polarized incident wave is achieved in the frequency band from 5 GHz to 8 GHz compared with the reference conformal array.
　　The RCS reduction of scattering grating lobe in wide-angle stealth is investigated, and the characteristic mode theory is used to the design of the conformal antenna. The scattering grating lobe reduction of the conformal array antenna is achieved by adjusting the scattering pattern of the cell. Firstly, the wide-angle domain characteristic analysis is carried out for the conformal cell. The main radiating and scattering characteristic modes are analyzed by modal weighting coefficient, modal currents and modal electric fields. The conformal cell is adjusted according to the current distribution of the main scattering modes. Compared with the reference antenna, the new cell realizes wide-angle domain’s scattering reduction by decreasing the scattering pattern amplitude without depraving the radiation performance of the array. The designed conformal array operates in the frequency band from 4.96 GHz to 6.78 GHz. The RCS reduction of the scattering grating lobe of x-polarized incident wave is achieved in the frequency band from 5 GHz to 8 GHz compared with the reference conformal array.