Validation of an algorithm for the reconstruction of an inhomogeneous dielectric profile

As part of an ongoing programme of research conducted at Liverpool University into the characterisation of building materials using nonintrusive test methods, a wide band TEM horn facility has been developed for the reconstruction of electromagnetic properties by direct inversion of the reflected signal from the material. This employs an algorithm based on a novel microwave network theory approach in conjunction with a numerical optimisation technique. This paper summarises the measurements undertaken on various combinations of materials for the validation of this method, along with a detailed description of the microwave network theory adopted within the optimisation model.