The generalized structure of the microstrip multiconductor line (MMCL) is shown in Fig. 1 (a). The MMCL consists of a dielectric substrate with a conducting layer (ground plane) on the one side and microstrip conductors on the other side. The number of microstrip conductors, their width and space between them may be specified independently. Due to their planar design these lines are broadly used in many electronics areas, e.g. as transmission lines for data paths in computer systems and integrated circuits [1], directional couplers [2], etc. MMCL are also successfully used as physical models designing microwave devices such as retard systems [3-5] (Fig. 1 (b)), antennas [6], etc.
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