Patent ID: 8400234

Claim:
An apparatus for removing a leakage signal, the apparatus comprising: a coupler comprising: a transmission port through which a transmission signal is input; an antenna port through which the transmission signal is output to an antenna and a receiving signal is input from the antenna; and a receiving port through which the receiving signal is output; a removing unit which is connected to the receiving port and outputs, to the receiving port, a leakage removing signal having a same magnitude as one of or a sum of a magnitude of a first leakage signal of the transmission signal, which is generated at the transmission port and input to the receiving port, and a magnitude of a second leakage signal of the transmission signal which is input to the receiving port through the antenna port, the leakage removing signal having an opposite phase to one of the phases or an aggregate phase of the first and second leakage signals; a leakage signal detector which detects at least a portion of the first leakage signal and the second leakage signal; and a controller which outputs a control signal corresponding to the detected at least the portion of the first and second leakage signals, wherein the removing unit receives the control signal to output the leakage removing signal, and wherein the removing unit comprises at least a portion of a first diode and a second diode that adjust an output value of the leakage removing signal by using the control signal.