CST Design Studio Voltage Signal Source

Hello,
I am currently trying to simulate a full wave bridge rectifier in the design studio portion in CST to use with an antenna. First my professor wants me to simulate the rectifier in CST using the signal voltage source and I want to set the frequency of the source to 2.45 GHz, but I cannot figure out how to change this parameter.
Any help would be appreciated.

hi,
personally I have never try it, but I suppose that it can be done using Simulation->Signal.
I have attached an image , Hope that it will help you!
regards!