| 摘要 |
PURPOSE: A diplexer circuit for a dual band communication terminal is provided to improve coupling phenomenon and isolation by being discretely composed. CONSTITUTION: A resonance circuit has a capacitor(C1) and an inductor(L1) for reflecting an other frequency except for a cellular frequency band from an RF(Radio Frequency) received through an antenna(Ant). A capacitor(C3) grounded at its one side connects to the resonance circuit in parallel for dividing the cellular frequency band in a cellular frequency path. A short resonance unit includes a capacitor(C2) and an inductor(L2) for reflecting an other frequency except for a PCS frequency band from the RF signal received through the antenna(Ant). The PCS frequency band is divided in a PCS frequency path for improving selectivity in the frequency band output through the short resonance unit.
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