Invariants of the time-reversal operator for a dielectric cylinder using different Tx and Rx arrays

In this work we have measured the time reversal invariants of dielectric cylinders for different Tx and Rx arrays. The results have been interpreted in terms of normal modes decomposition of the scattered field. We use this approach to find out some cylinder parameters such as location, radius, and permittivity. To this purpose, we have developed an inverse method based on the decomposition of the time reversal operator. The use of several significant time reversal invariants greatly improves the accuracy of the inversion.