mutual conductance

Hi,

Is there anyone who can help my calculate the mutual conductance for a microstrip patch antenna(G21). I have a formula in "Antenna Theory" by Balanis, but I cannot get the right answer when I implement it in Matlab.

Is there anyone who can help me? :(

i have the same problem. I am unable to implement eq 14.92 of balanis 3rd edition.
pl upload ur matlab file