| 摘要 |
PURPOSE: A transmission band pass filter of a duplexer is provided to achieve improved attenuation characteristics of the transmission filter by connecting a spiral inductor between the resonator and the transmission terminal. CONSTITUTION: A duplexer comprises a dielectric block(100) which including a transmission filter region(200) and a receiving filter region(300). The dielectric block includes a top surface(105), a bottom surface and a side surface(104), and the bottom surface and the side surface are coated with a conductive material. First to fourth resonators(201,202,203,204) are arranged in the dielectric block. A spiral inductor(205) is arranged between the first resonator and a transmission terminal(101) which are formed on the top surface of the dielectric block so as to achieve improved stop band attenuation characteristics of the transmission terminal during transmission.
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