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    • 9. 发明授权
    • Filter, demultiplexer, and module including demultiplexer, communication apparatus
    • 滤波器,解复用器和模块,包括解复用器,通信设备
    • US08228137B2
    • 2012-07-24
    • US12709182
    • 2010-02-19
    • Shogo InoueJun TsutsumiTakashi MatsudaMasanori Ueda
    • Shogo InoueJun TsutsumiTakashi MatsudaMasanori Ueda
    • H03H7/46H04B1/48H03H9/52H03H9/70
    • H03H9/0576H03H9/725
    • A demultiplexer has a common terminal, a transmission terminal, and a reception terminal, and furthermore includes a transmission filter connected between the common terminal and the transmission terminal, a reception filter connected between the common terminal and the reception terminal, and a phase shift circuit connected in series to the reception filter connected between the common terminal and the reception terminal. A node on the line from the phase shift circuit to the common terminal or the transmission terminal, and a node on the line from the phase shift circuit to the reception terminal are coupled via a reactance. Accordingly, it is possible to fundamentally reduce or eliminate the situation in which transmission signals from the transmission filter arrive at the reception circuit, and improve isolation.
    • 解复用器具有公共端子,发送端子和接收端子,并且还包括连接在公共端子和发送端子之间的发送滤波器,连接在公共端子和接收端子之间的接收滤波器以及相移电路 与连接在公共端子和接收端子之间的接收滤波器串联连接。 从相移电路到共用端子或发送端子的线路上的节点,以及从相移电路到接收端子的线路上的节点经由电抗耦合。 因此,可以从根本上减少或消除来自发送滤波器的发送信号到达接收电路并且改善隔离的情况。