What happens when antenna receives and transmits signal at the same time?

hi want to know that if an antena transmit and receive signal at same time ( full duplex) , then what is happening in the matel of antenna i mean if waves are received and send same time then the current also going and coming in same pasth at same time ?

I think the in and out frequency is different, so we can select the right signal.

Hi,

FullDuplex systems utilize their channel spectrum in a way the transmitting and receiving channels are isolated to each other thus the carrier frequency for transmission is different from reception. (correct me if Im wrong)

to sepearate the signals add a circulator to the antenna or just a coupler to see the received signal