Apparatus for cancelling radio frequency interference between transmitting antenna and receiving antenna, repeating system and transmitting and receiving system using the same

摘要

Apparatus for cancelling radio frequency interference between a transmitting antenna (21) and a receiving antenna; a repeating system; and a transmitting and receiving system using the apparatus. The apparatus for cancelling radio frequency interference between a transmitting antenna and a receiving antenna cancels interference by adding an interference signal to the 180° phase-shifted signal of the interference signal to obtain a desired signal. The apparatus provides an interference canceller (27) which attenuates the transmitting signal so as to have the same amplitude as the signal radiated through the transmitting antenna (21) and received by the receiving antenna (the interference signal) (21) but with reversed phase. As the attenuated signal is combined with the received signal including the interference signal, only the desired signal remains.