Dielectric Permittivity Measurement of Kraft Paper by the Resonant Ring Method

Dielectric permittivity is one of the most important parameters in the field of telecommunications, since it indicates an interaction value between the substrate and an electric field. Lately the paper has had a great acceptance for the development of new technologies, therefore, the permittivity of the Kraft paper was measured to be used as a substrate, in telecommunications applications. For the measurement of the dielectric permittivity of Kraft paper, a resonant ring structure was designed. The design of the ring requires a frequency of operation or resonance, moreover, to an impedance coupling between the measuring equipment and the resonator. The structure of the resonant ring was simulated obtaining the coefficient of direct transmission (S21), validating the design for its construction. S21 was acquired by the NI-PXI instrument in a practical way; this parameter allows the calculation of the effective dielectric permittivity and later the relative. Finally, the process revealed a value of 1.40, relative dielectric permittivity for Kraft paper.