A numerical method for the estimation of relative permittivity of dielectric materials

A broadband approach to estimate relative permittivity of dielectric cuboids has been proposed. Our method involves a numerical iterative scheme with appropriate initial values to solve for the permittivity in a wide range of frequency. Good agreement between the method and references has been observed. It is assumed that the material has a weak frequency dispersive characteristic. An applicable range relation between the smallest thickness, the dielectric property of material has also been discussed.