Resolving scattering in complex media: a hybrid THz model for multilayer building materials

Accurate terahertz scattering models for multilayer building materials are vital for the design of 6G systems, but current methods are either too simple or computationally expensive. We introduce a hybrid multilayer scattering model that unites a recursive method for coherent scattering with the scalar Kirchhoff approximation for the incoherent portion; a physics-based coefficient partitions power between these components. Compared with the experimental data, the proposed model can decrease the root-mean-square error by as much as 89.6 % when modeling complex laminated materials. The proposed model is a physically robust and computationally efficient tool for designing THz imaging tools and indoor 6G networks.