frequency domain study of a heat transfer model

Hi everyone.

I am new to comsol, it would be appreciated if someone helps me. I want a frequency domain study analysis of a heat transfer model. Is there an easy way in comsol to do this.?

Basically I have a dielectric resonator antenna DRA, I perform thermal simulation using Heat transfer model analysis to analyze the effect of ambient temperature on the surface of DRA over certain period of time. Now I want to saw the radiation pattern and S11 parameters of antenna, that what is the effect of temperature on the radiation pattern of antenna.?

Thanks in advance.