| 摘要 |
PURPOSE: A diplexer circuit of a dual band communication terminal is provided to be configured in a discrete system, thereby improving insertion loss in a high frequency and increasing band selection. CONSTITUTION: A resonant circuit(100) is composed of a capacitor(C1) and an inductor(L1). The capacitor(C1) receives a wideband frequency signal to reflect other frequencies except a low frequency band. A low frequency band path connects a capacitor(C3) grounded on one side of the resonant circuit(100) in parallel, and separates a low frequency band. A short resonant circuit(200) is composed of a capacitor(C2) and an inductor(L2). The capacitor(C2) reflects other frequencies except a high frequency band from the wideband frequency signal. A high frequency band path is connected to an open resonator for improving selection in a frequency band outputted through the short resonant circuit(200), and separates the high frequency band. A shunt capacitor(C5) is located in an antenna to receive a wideband frequency band.
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