Reply To: Discontinuity at the boundary of the substrate and waveguide of AlN-on-sapphire

[Guilin Sun]

Ez is not continuous since it is normal to the boundary;

When there is field inside the substrate, it does not necessarily mean leakage, of course depending on your definition of leakage. Usually when the substrate is lossy we can say leakage. You can calculate the loss inside the sub strate.