EBG structure
An EBG structure is consisted of 6 layers of dialectic cylinders in one direction and the periodic structure in another direction, and the cylinder is infinitely long. GEMS only needs to simulate one element (6 cylinders) and the domain is truncated by the PML and PBC (periodic boundary condition). The default options are used to generate the reflection and transmission coefficients.

EBG Structure

Time domain field distribution
Reflection and transmission

Time domain reflected field

Reflection coefficient
Frequency domain field


Transmission coefficient