Guilin Sun
Ansys Employee

This is a more theoretical question. I will try to answer as follows:

EME forces the tangential fields E and H to be conticnuous between two adjacent cells. Ideally, this can be fulfilled when an infinite number of modes are used. In reality, and due to a limited number of modes, the condition of continuous tangential fields is not well fulfilled. Therefore, when a few modes are used, it forces to fulfill the conditions, which may elevate the transmssion. Higher order modes should carry some power.