COMMUNICATION SYSTEM HAVING FUNCTION FOR COMPENSATING FLATNESS OF PASSED BAND

摘要

PURPOSE: A communication system having a function of compensating for flatness of a passed band is provided to improve flatness of a riffle by using a flatness compensation circuit including a complementary band pass filter. CONSTITUTION: An amplification circuit(11) is installed at a rear end portion of a communication system to amplify an input signal. The amplification circuit(11) is connected with a main band pass filter in order to improve a total loss of a circuit. A complementary band pass filter(12) is connected with the amplification circuit(11). The complementary band pass filter(12) generates a riffle having an opposite characteristic to a riffle of the main band pass filter in order to improve flatness of the distorted riffle of the main band pass filter. The first attenuation circuit(13) is used for improving a characteristic of a reflection loss of the complementary band pass filter(12).