Scattering Characteristics of Vortex Electromagnetic Waves Based on Scattering Center Model

In this paper, a scattering center model for targets illuminated by vortex electromagnetic (EM) waves is presented. By employing the vector angular spectrum decomposition approach, the incident vortex beam is decomposed into a series of plane waves. Based on the geometric relationship between the target and the incident field, the whole scattering field is represented as a superposition of the scattering contributions from individual plane waves originating from all scattering centers of the target. The proposed approach is applied to three standard targets and a composite model to compute their bistatic scattering responses. The proposed scattering center model for vortex electromagnetic waves is validated using high-frequency approximation methods and the Method of Moments (MoM). The numerical results exhibit good agreement with the simulation data, demonstrating the effectiveness and accuracy of the proposed method. This method offers a promising tool for rapid scattering characteristics prediction in vortex EM wave radar detection and imaging applications.