Reconstruction of microwave structures using two-dimensional inverse TLM (Transmission Line Matrix) method

This work proposes a new reconstruction procedure of two-dimensional microwave structures based on the inversion of the two-dimensional TLM (Transmission Line Matrix) method. The technique is based on the solution of the inverse scattering problem using a TLM based algorithm. The procedure consists of determining the geometry of the obstacle that generates the desired scattered field. In the case of TLM this field is the time-domain input reflection coefficient at all input terminals and the geometry is the impedance at all nodes of the TLM mesh. The procedure can be used to reconstruct objects with arbitrary characteristics in small TLM meshes.

I. Introduction

The solution of inverse problems is a promising area in Electromagnetics. This kind of problem is quite different from the problems handled by popular field solvers. In field analysis problems, one uses computational tools to determine the unknown field. created by a particular known configuration of sources and boundaries. In the inverse problem, it is necessary to determine what is the unknown configuration of sources and boundaries that result in a particular known field.