Antenna

Hi in CST I want to simulate 2 antennas , the first one is to transmit and the other one to receive . When I run the simulation in CST it excites both antennas separately but I need to do this only for the first one and want to see the energy received by the other one.

You can define 2 ports and observe S21 parameter. This will show how much from transmitted energy is received by second antenna. S12 will show contraversa relation.

What kind fo antennas you are dealing with?