FRONT END CIRCUIT OF MOBILE TERMINAL

摘要

The present invention relates to a front end circuit of a mobile terminal. The front end circuit of a mobile terminal comprises: an LTE band unit which filters a frequency of transmitted/received signals in a corresponding band by an LTE band pass filter (BPF); and an industrial scientific medical (ISM) band unit which filters a frequency of the transmitted/received signals in a corresponding band by an ISM BPF, wherein first and second ISM BPFs to pass signals in a different frequency bands are installed between an antenna of the ISM band unit and a switch for switching the transmitted/received signals, and the first ISM BPF or second ISM BPF, which has a bandwidth corresponding to a used frequency, is selected to transmit/receive the signals. According to the present invention, the total bandwidth of the LTE band adjacent to the ISM band can be used by applying two different kinds of band pass filters with different bandwidths to the ISM band and changing bandwidths of the band pass filters in accordance with used frequencies.