RCS control method for phased array based on scattering mode cancellation network

An RCS control method for phased array based on a scattering mode cancellation network is proposed, which achieves precise scattering regulation while preserving radiation performance. Analytical relationships among the load resistance, additional phase, antenna mode scattering field (AMSF), and structural mode scattering field (SMSF) are derived from scattering mechanism. Based on the derived formulas, AMSF under different terminal resistances and phase delays can be rapidly predicted form original array data, avoiding repeated full-wave computations and enabling arbitrary scattering pattern optimization. The total scattering field is synthesized from SMSF and modulated AMSF, achieving precise definition through scattering mode cancellation. Additionally, to maintain radiation performance, an impedance matching network is designed to ensure port matching. An 8-element linear array is designed to validate the proposed method. RCS reduction cases are presented to demonstrate that the method can precisely control the RCS to any target value at a designated incidence angle or angular domain, while preserving good radiation performance. Specifically, the RCS of designed array is reduced to -60 dBsm at normal incidence, -50 dBsm at oblique incidence, and below -40 dBsm across the entire angular domain. The arrays are fabricated, and the numerical results are validated through experiments.