New interesting leakage behavior on microstrip lines with a slot on a ground plane

We have proposed here a new structure of a microstrip line in which the dominant-mode leaks above some critical frequency or all frequencies. This structure has a slot on the ground plane and also has dielectric multilayers under it. The appropriate combination between dielectric layers produces the leakage into the multi-layers. This means that the leaky field does not leak into the substrate of the microstrip line and so we can get the lossy uniform microstrip line above the critical frequency without affecting the surrounding circuit. We present here the dependence of the structural parameters of the proposed guide on the leakage properties.