Where does the RF module work?

Where does the RF module work?

Radio frequency modules have many uses, and almost all electronic devices with radio frequency will be used. For example: the radio frequency module of the mobile phone, the radio frequency module of the GPS receiver for navigation, and the high frequency head of the TV (also a form of the radio frequency module). The function of the radio frequency module is to convert radio signals into wired electrical signals, or vice versa. Why do we separate the wired electrical signal from the radio signal, because of the particularity of the radio signal, its signal is weak, and the interference is very strong, it may be very powerful, that is, it either interferes with or is interfered by others, so In the circuit, we usually separate them from the general circuit, separate from all aspects, power, ground, space and so on. ==RF filter