Want to change the resonant frequency of operation to 2.45 GHZ of the example: Modeling Resonant Coupled Wireless Power Transfer System

I have chaned the code in the following ways, but it is not working satisfactorily:

The following code is used for resonating the system at 2.45 GHZ ; can you suggest how to make it feasible to work at microwave frequency range. Thanks in advance ....

fc=2450e6;
fcmin = fc-2000;
fcmax = fc+2000;
fband1 = (fc-3000):50e6:fcmin;
fband2 = fcmin:5e6:fcmax;
fband3 = fcmax:1e6:(fc+3000);
freq = unique([fband1 fband2 fband3]);
pt=linspace(-0.3,0.3,61);
[X,Y,Z]=meshgrid(pt,0,pt);
field_p=[X(:)';Y(:)';Z(:)'];