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    • 8. 发明授权
    • Filter using film bulk acoustic resonator and transmission/reception switch
    • 使用薄膜体声波谐振器和发射/接收开关进行滤波
    • US06885260B2
    • 2005-04-26
    • US10476218
    • 2002-05-10
    • Kosuke NishimuraKeigo NagaoChisen HashimotoEiji MasuiHirofumi Kimura
    • Kosuke NishimuraKeigo NagaoChisen HashimotoEiji MasuiHirofumi Kimura
    • H03H7/19H03H9/05H03H9/58H04B1/52H03H9/70H03H9/56
    • H03H9/706H03H7/19H03H9/0571H04B1/52
    • A transmission band filter (110) having a series of elements (111, 113, 115) each composed of a film bulk acoustic resonator and grounded shunt elements (112, 114) each composed of a film bulk acoustic resonator is connected between a transmission port (102) and an antenna port (106). A reception band filter (130) having a series of elements (131, 133, 135) each composed of a film bulk acoustic resonator and grounded shunt elements (132, 134, 136) each composed of a film bulk acoustic resonator is connected between a reception port (104) and the antenna port (106). A film bulk acoustic resonator (150) for adjustment is connected between the antenna port (106) and the ground. The resonance frequency of the adjusting film bulk acoustic resonator (150) lies between the upper limit frequency of the transmission frequency pass band of the transmission band filter (110) and the lower limit frequency of the reception frequency pass band of the reception band filter (130). Therefore a duplexer such that it can be a monolithic element, the power handling capability is good, the size is small, and the cost is low is provided.
    • 具有由薄膜体声波谐振器构成的一系列元件(111,113,115)的传输带滤波器(110)和由薄膜体声共振器构成的接地分流元件(112,114)连接在传输端口 (102)和天线端口(106)。 具有由薄膜体声波谐振器和由薄膜体声波谐振器组成的接地分路元件(132,134,136)构成的一系列元件(131,133,135)的接收带滤波器(130)连接在 接收端口(104)和天线端口(106)。 用于调整的薄膜体声共振器(150)连接在天线端口(106)和地面之间。 调整膜体声波谐振器(150)的共振频率位于传输带滤波器(110)的发送频率通带的上限频率与接收频带滤波器的接收频率通带的下限频率之间 130)。 因此,双工器可以是单片元件,功率处理能力好,尺寸小,成本低廉。