Inverse problem for a nonuniform LCRG transmission line using global optimization techniques

The inverse problem for reconstruction of the impedance profile nonuniform transmission line from the reflection coefficients measured at a finite number of frequencies is considered. The inversion method is based on the minimization of an, objective function by the multilevel single-linkage method, known as an efficient global optimization, technique. An exact formulation for the gradient of the objective function in closed-farm is derived. Numerical examples using both clean and noisy data are presented.