rectangular waveguide

例句：

1. 1. The rectangular waveguide is used to transmit radiowaves.
   矩形波导用于传输无线电波。
2. 2.The rectangular waveguide is anessential component of the communication system.
   矩形波导是通信系统的一个基本组成部分。
3. 3. Therectangular waveguide is designed tominimize reflections and improve signal quality.
   矩形波导的设计旨在减少反射并提高信号质量。