Method of lines analysis of coupled microstrip transmission line with a notch

The purpose of this paper is to investigate the characteristics of a two symmetric conductor microstrip line with a notch in the millimeter wave frequency range. Previous quasi-static based data was reported and an extension of some of these data to higher frequencies is considered here. The numerical technique, method of lines (MoL), is used to compute the effective dielectric constants and the phase velocities of the even and odd modes at higher frequencies up to 100 GHz. The results show that the quasi-static based characteristics are not necessarily valid at higher frequencies.