directional coupler

例句：

1. 1. Thedevice is used to convert electrical signals into acoustic waves.
   这个设备用于将电信号转换为声波。
2. 2. In the field of communication, directional couplers are widely used in wireless systems.
   在通信领域，定向耦合器被广泛应用于无线系统中。
3. 3.The engineer designed a directional coupler to improve the signal-to-noise ratio of the system.
   这位工程师设计了一个定向耦合器来提高系统的信号与噪声比。