A new extraction method for the characteristic impedance and effective dielectric constant of transmission line with DGS

In this paper, we propose a new extraction method for the characteristic impedance and effective dielectric constant of a microstrip line. It extracts the characteristic impedance and effective dielectric constant of a microstrip line that uses the results of S-parameters through the EM-simulation. And it also extracts the characteristic impedance and effective dielectric constant of microstrip line with DGS and compare the variation of frequency response. We simulate a microstrip line which has a dumbbell type DGS, and extract the electrical length, characteristic impedance and effective dielectric constant according to the DGS´s size and the number of DGS. From these results, we analyze how DGS influence the variation of the transmission line characteristics such as the characteristic impedance and effective dielectric constant of a microstrip line.