Matlab-based accurate dispersion models for unshielded suspended microstrip

Suspended microstrip, shown in Fig.1 (unshielded case) and Fig. 2 (shielded case), is a very useful variation of the conventional microstrip structure. This transmission line is created by introducing an air-gap between the ground plane and the substrate, as shown in Figs. 1 and 2. The main advantages of this type of microstrip, over the conventional microstrip, follow.