Metallic losses, COMSOL

Hi all,

I've been trying to simulate electric field inside a waveguide with
metal rods. But it seems there is less losses than as it should be. I
defined rods as a subdomain with epsilon and sigma but it gives wrong
results, then I tried impedance boundary condition for rods but I
don't know what value to be given the surface electric field, or what
else I can do to observe metallic losses?

Thanks.

Setting some proper value for \sigma is the right way. Maybe the provided value was not correct. BTW, how did you check the result?

I think, I've set a proper value for sigma, I checked transmission results from a paper. Anyway, the problem is to define metallic rods is that enough defining as a subdomain and giving parameters? Or should I take skindepth into account, but how? For this I tried to use boundary condition for rods, but still have the same problem.

Thanks