I'm trying to understand how an antenna is able to understand, but have a few quesions:
I understand that for an antenna to distinguish between 2 (or more) signals, they have to be in different frequencies. This means that, for example, every mobile phone transmits in a unique frequency? otherwise the signals would mix in the antenna..
So if I want to disrupt a signal that an antenna receives, I need to transmit some sort of noise in the same frequency (preferably the inverse of the received wave), and then the antenna couldn't understand that signal?
Also, a third question (not related to the last two): what is the tolerance of an antenna? How sensitive it can get? for example, how far away from a transmitter an antenna could receive the sent message (e.g. in communication between earth and a satellite).