| 摘要 |
PURPOSE: A reception device of a mobile communication terminal is provided to implement a reception band filter and a dual SAW(Surface Acoustic Wave) BPF of a triplexer into two filters, respectively, and to perform transmission band suppression in dual method by the reception band filter and the dual SAW BPF, thereby reducing insertion loss and obtaining high transmission band suppression characteristics. CONSTITUTION: A triplexer(120) consists of a transmission band filter(123) and a reception band filter. The transmission band filter(123) delivers a transmission signal received from a transmitter(130) to an antenna(110). The reception band filter comprises a low frequency reception band filter(125) and a high frequency reception band filter(127). The low frequency reception band filter(125) passes a lower frequency band. The high frequency reception band filter(127) passes a higher frequency band. The first SAW BPF(143) consists of two SAW BPFs(143a,143b), and receives signals outputted from the reception band filter, respectively. An SPDT(Single-Pole Double-Throw) RF switch(145) receives all signals outputted from each of SAW BPFs(143,149), and makes one signal. The second SAW BPF(149) receives signals outputted from the SPDT switch(145).
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