| 摘要 |
A duplexer according to the present invention includes a transmission-side terminal, a reception-side terminal, a common terminal, a transmission-side circuit unit, and a reception-side circuit unit. Here, the transmission-side circuit unit is connected between the transmission-side terminal and the common terminal. The reception-side circuit unit is connected between the common terminal and the reception-side terminal. The transmission-side circuit unit includes a first transmission-side filter, a second transmission-side filter, and a transmission-side directional propagation circuit. Here, the first transmission-side filter is provided in the subsequent stage of the transmission-side terminal. The second transmission-side filter is provided in a stage subsequent to the first transmission-side filter. The transmission-side directional propagation circuit is connected between the first transmission-side filter and the second transmission-side filter. The reception-side circuit unit includes a first reception-side filter, a second reception-side filter, and a reception-side directional propagation circuit. Here, the first reception-side filter is provided in the subsequent stage of the common terminal. The second reception-side filter is provided in a stage subsequent to the first reception-side filter. The reception-side directional propagation circuit is connected between the first reception-side filter and the second reception-side filter. |
| 主权项 |
1. A duplexer comprising:
a transmission-side terminal for inputting a transmission signal; a reception-side terminal for outputting a received signal; a common terminal for inputting the transmission signal from the transmission-side terminal and outputting the received signal to the reception-side terminal; a transmission-side circuit unit connected between the transmission-side terminal and the common terminal; and a reception-side circuit unit connected between the common terminal and the reception-side terminal, wherein the transmission-side circuit unit includes:
a first transmission-side filter provided in a subsequent stage of the transmission-side terminal to allow passage of a predetermined transmission-band component in the transmission signal;a second transmission-side filter provided in a stage subsequent to the first transmission-side filter to allow passage of the transmission-band component in the transmission signal; anda transmission-side directional propagation circuit connected between the first transmission-side filter and the second transmission-side filter to propagate, in a specific direction, a signal input from one transmission-side terminal and output the signal from the other transmission-side terminal, and the reception-side circuit unit includes:
a first reception-side filter provided in a subsequent stage of the common terminal to allow passage of a predetermined reception-band component in the received signal;a second reception-side filter provided in a stage subsequent to the first reception-side filter to allow passage of the reception-band component in the received signal; anda reception-side directional propagation circuit connected between the first reception-side filter and the second reception-side filter to propagate, in a specific direction, a signal input from one reception-side terminal and output the signal from the other reception-side terminal. |
