A directional coupler is a specialized passive device used in radio frequency (RF) and microwave applications to sample power from a transmission line. It features multiple ports that allow signals to be coupled in a specific direction, making it ideal for measuring signal strength or monitoring transmission without interrupting the main signal path. By isolating input and output signals, directional couplers minimize reflections and enhance system performance. They are commonly used in testing, telecommunications, and signal processing, providing critical data for troubleshooting and system analysis. Compact and efficient, directional couplers are essential for effective RF management.
