DETERMINATION OF REFLECTION AND TRANSMISSION COEFFICIENT OF PTFE AT X-BAND FREQUENCY USING NRW AND FEM METHODS

This paper presents a comparison of measurement results of polytetrafluoroethylene (PTFE) is loaded waveguide between Nicolson-Ross-Weir (NRW) method and Finite Element Method (FEM).The permittivity of PTFE values obtain from optimization technique and errors analysis have been conducted for scattering parameters in calculation and simulation results, variation mean relative errors with thickness of sample have been found and plotted.