The RCPL-2-18-xdB-Sf-20W-M1-w18 from Raditek is a Directional Coupler with Frequency 2 to 18 GHz, Coupling 10 to 30 dB, Coupling Variation ±1 to ±2 dB (Coupling Tolerance), Directivity 14 to 15 dB, Average Power 20 W. Tags: Module with Connectors. More details for RCPL-2-18-xdB-Sf-20W-M1-w18 can be seen below.