FILTER OF REPEATER FOR MOBILE COMMUNICATION SYSTEM

摘要

The present invention relates to an IF filter for a repeater of a mobile communication system, which can minimize a delay caused by an IF filter for an RF repeater of a mobile communication system such as a LTE OFDMA system, thereby enabling a normal cyclic prefix (CP) 4.7 usec to be used as much as possible. The IF filter for a repeater of a mobile communication system according to an embodiment of the present invention comprises: a band pass filter (BPF) for inputting a signal in the band of intermediate frequency equal to or higher than 500 MHz and conducting filtering for obtaining a desired signal in the band of intermediate frequencies; an inverter for generating and outputting a signal with a reversed phase having deteriorated ripple characteristics to compensate for the deteriorated ripple characteristics of the signal output from the BPF; and a circulator for removing the deteriorated ripple characteristics included in the output signal of the BPF by combining the output signal of the BPF with the output signal of the inverter and outputting a generated signal.