Modeling of Camouflage Grass and the Calculation of its Electromagnetic Scattering Characteristics

In this work, the complex electromagnetic model of a camouflage grass was accurately generated in geometry, of which the grass leaves were represented by lathy curved rectangular metal surfaces. To investigate the electromagnetic scattering characteristics of the camouflage grass model in the radar band, its radar cross section (RCS) from 4 GHz to 18 GHz was calculated by multilevel fast multipole method (MLFMM). For validation, the camouflage grass sample was manufactured and measured. A relatively good agreement was observed between the results of the calculation and the measurement. Based on this modeling and calculation method, the electromagnetic scattering characteristics of camouflage grass with different leaf lengths, widths, and densities were investigated. According to the numerical results of the application examples, the electromagnetic scattering characteristics changed regularly with the variation of the leaf parameters, and these results were analyzed by electromagnetic wave scattering and phase cancellation. This model will help with the radar camouflage experimental design and electromagnetic scattering investigation of camouflage grass.