The RCPL-2.0-4.0-30d-Sf-50W-F-w18 from Raditek is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 6 to 30 dB, Coupling Variation ±1 to ±1.25 dB, Directivity 18 to 22 dB, Average Power 4 to 50 W. Tags: Module with Connectors. More details for RCPL-2.0-4.0-30d-Sf-50W-F-w18 can be seen below.