noise analysis in microwave office

hi all
I'm going to analyze SNR in wilkinson power divider.I meant i want to introduce some signal with certain value of noise in one port of wilkinson power divider and see the effect of power divider on SNR in other ports in AWR microwave office.would you please guide me simulate it in that software?
I dont know how I can introduce some signal with certain value of noise added
THANKS IN ADVANCE

Wilkinson as a passive device do not introduce noise in the circuit, but it's insertion loss (about 3dB) will affect the system noise figure.
So, in the simulator don't need to add a noise source, but just a simple 3dB pad attenuator.

hi
thanks for your reply
I was aware of what you said.But if I want to simulate anyway, how can I do that?
Imagine I'm going to simulate some device (including passive or active devices),how can I introduce noise sources in microwave office?

In Circuit Elements you have Noise Sources.

hi again
yes.but what kind of noise source have to be choose?

actually I have connected different noise sources and set up different measurments, But I coulden't establish the proper result.would you please tell me about the source and measurment setup more precise