You will probably like this website:

http://ece.wpi.edu/mom/

thank you very much. it is extremely interesting.

Dear researcher,

To model the patch using the MoM  (or BEM) you need to use:

• The maxwell' equations in their integral form
• The boundary conditions on the surfaces delimiting the space occupied by your antenna
• The definition of a mesh for boundary surfaces

you will find an equation like the green' function that can be computed numerically

(I supposed you substarte is homogeneous or linear)

good luck