General description:

A directional coupler couples a fraction of high frequency (RF) power flowing in forward direction to a port. Power reflecting from the load is coupled to another (reverse) port but not to the forward port. Main RF power flows through with only a small attenuation.

Hardware:

Documents:

Main line attenuation

Coupling IN- Forward Coupled port

Directivity (How much reverse power is coupled to the forward coupled port)

Schematic

PCB