| 摘要 |
PURPOSE: A diplexer circuit of a dual band terminal is provided to configure an equivalent circuit to a low-frequency band parallel resonator and a high-frequency band serial resonator, and to directly form parallel resonators on a substrate, thereby improving diplexer performance. CONSTITUTION: The first capacitor(C10) is located between an antenna(Ant10) and a high-frequency band output unit. The first inductor(L10) is connected with the first capacitor(C10) in parallel, and configures the first parallel resonator circuit for forming the first low band. The second capacitor(C20) is located between the antenna(Ant10) and a low-frequency band output unit. The second inductor(L20) is connected with the second capacitor(C20) in parallel, and forms the second low band. The third capacitor(C30) is connected between the low-frequency band output unit and a ground, and configures a low pass filter.
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