APPARATUS FOR ELIMINATING LEAKAGE SIGNAL BY USING EXCELLENT RF MIXER

摘要

PURPOSE: An apparatus for eliminating a leakage signal by using an excellent RF(Radio Frequency) mixer is provided to prevent a spurious wave of a transmitter and a performance degradation of a receiver by eliminating the leakage signal of a local oscillation signal generated in a satellite and a frequency converter of a communication system. CONSTITUTION: An in-phase divider(160) divides a local oscillation signal inputted from the outside into in-phase local oscillation signals. An IF(Intermediate Frequency) phase divider(180) divides an IF signal inputted from the outside into IF signals with 90° phase difference. The first and second excellent RF mixers(170) mix the local oscillation signal divided from the in-phase divider(160) with the IF signal divided from the IF phase divider(180), and output RF(Radio Frequency) signals with 90° phase difference, respectively. An RF signal phase combiner(190) performs the 90° phase combination of the RF signals mixed in the first and second excellent RF mixers(170), and eliminates an image signal. A BPF(Band Pass Filter)(200) eliminates a residual component of a leakage signal from the RF signal of the RF signal phase combiner(190).