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    • 9. 发明授权
    • BAW duplexer without phase shifter
    • BAW双工器无移相器
    • US07339445B2
    • 2008-03-04
    • US11246996
    • 2005-10-07
    • Robert AignerMartin Handtmann
    • Robert AignerMartin Handtmann
    • H03H9/70
    • H03H9/706
    • A duplexer for connection with an antenna comprises an antenna port, a transmitting filter comprising bulk acoustic wave (BAW) resonators having a first antenna side impedance coupled with the antenna port, a receiving filter comprising BAW resonators having a second antenna side impedance coupled with the antenna port, and a shunt inductance coupled between the antenna port and ground. The shunt inductance and the first and second antenna side impedances of the transmitting filter and the receiving filter are selected in such a way that the shunt inductance turns the first and second input impedance in a negative direction in a Smith diagram.
    • 用于与天线连接的双工器包括天线端口,发射滤波器,包括具有与天线端口耦合的第一天线侧阻抗的体声波(BAW)谐振器,接收滤波器,包括具有与第二天线侧阻抗耦合的第二天线侧阻抗的BAW谐振器 天线端口和耦合在天线端口和地之间的并联电感。 选择发射滤波器和接收滤波器的并联电感和第一和第二天线侧阻抗,使得并联电感在史密斯图中将负的第一和第二输入阻抗转变成负方向。