| 摘要 |
PURPOSE: A duplexer, a substrate for a duplexer, and an electronic device thereof are provided to improve an isolation property in the entire transmission band by improving an isolation property for a transmission signal which has wide phase width. CONSTITUTION: A transmission filter is connected between a common terminal and a transmission terminal. A receiving filter is connected between the common terminal and the receiving terminal. A capacitor(40) is connected to the transmission filter or the receiving filter in parallel between two terminals among the common terminal, the transmission terminal, and the receiving terminal. A foot pad(56) is formed in the rear side of a foot pad layer(51). The foot pad comprises an insulation layer, the common terminal formed in one side of the insulating layer, the transmission terminal, and the receiving terminal. A package comprises the one side of the insulating layer and a wiring which is formed in the opposite side. The capacitor comprises two capacitor forming parts.
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