Study on Stochastic Radiation Field of Spatiotemporal Evolving Electromagnetic Vortex Generated by Frequency Difference Arrays

In the application context of microwave staring correlation imaging, this paper proposes a spatiotemporal evolutionary vortex stochastic radiation field formation scheme based on frequency difference array. Under the condition of the same initial feed amplitude and phase, the vortex wave with automatic mode switching over time or space can be generated by introducing different frequency differences between the units of the array and the mode switching intervals are controllable. The vortex mode evolution law is analysed and verified by theoretical derivation and numerical simulation, and the convenience of generating vortex stochastic fields and the feasibility of the scheme for microwave staring correlation imaging are verified by simulation experiments.