We theoretically investigate the origin of resonance excitation in planar metamaterials placed longitudinally at the boundary of a two-layer dissimilar dielectric substrate integrated waveguide, as an approximation of integrated circuit electronics. The two-layer filled waveguide leads to the generation of longitudinal section modes with a non-zero orientation of E field along the propagation direction that contributes to the resonance current induction in the gap of metamaterial resonators. By implementing materials with different combinations of dielectric constants and thicknesses, precise control of the frequency and intensity of metamaterial resonance is achieved. The presented work has huge potential to replace existing complex technologies in integrated electronics at millimeter-wave frequencies and to promote new substrate integrated metamaterial applications, such as absorbers, phase shifters, and attenuators, for future wireless communication networks.