The RCPL-2-8-10d-S(f)-20W-z4 from Raditek is a Directional Coupler with Frequency 2 to 8 GHz, Coupling 10 dB, Coupling Variation ±1.2 dB, Directivity 16 dB, Average Power 20 W. Tags: Module with Connectors. More details for RCPL-2-8-10d-S(f)-20W-z4 can be seen below.