Experimental Verification of the Recursive T-Matrix Method Solutions at Microwave Frequencies

We present an experimental verification of the recursive T-matrix method (RTM), which is a common method for solving electromagnetic scattering from multiple scatterers. This is done using an antenna and propagation model uniquely suited for T-matrices and network analyzer measurements. In the experiments, we use a multistatic system to measure the scattering from collections of objects consisting of conducting or dielectric spheres, as well as conducting cylinders. In simulation, we calculate the scattering from the objects using the RTM and further predict the transition parameters expected between the receivers and the transmitter in the measurement setup using a propagation model. The predicted and measured values of the transmission parameters are compared, and thereby used to verify the recursive T-matrix algorithm. Good agreement observed in these results provides experimental validation of the RTM.