Influence of relative permittivity of jig made of microstrip line for S-parameter method

Recently, S-parameter method that is the measuring method of the input impedance of the balanced antenna with a vector network analyzer is proposed. The method requires a jig composed of two unbalanced feed lines such as microstrip lines. The jig must be calibrated to achieve accurate results especially at high frequencies. To remove the influence of the jig, we have proposed the open correction and the modified open correction. In this report, we examine the influence of the relative permittivity of the jig on the S-parameter method using the FDTD method.