| 摘要 |
PURPOSE: A device of removing a PIMD(Passive Intermodulation) signal is provided to remarkably reduce or remove a PIMD signal generated in a transmission band filter, and to configure two transceiving antennas to expand a communication range, thereby improving speech quality. CONSTITUTION: A transmission band filer(221) inputs multi FA(Frequency Allocation) signals, and passes the first predetermined band only of the inputted signals. The first and the second transceiving antennas(241,242) transmit the inputted signals in the air, and receive air signals. A receiving band filter(223) passes the second predetermined frequency band only of the inputted signals. A phase cancellation module(231) transmits the signals outputted from the transmission band filter(221) to the first and the second transceiving antennas(241,242), transmits the signals received through the antennas(241,242) to the receiving band filter(223), inputs a PIMD signal generated in the transmission band filter(221) to the receiving band filter(223), and branches the PIMD signals into many signals. The phase cancellation module(231) makes a reciprocal phase difference between the branched PIMD signals be at 180 degrees, and removes the PIMD signals.
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