The RCPL-4-40-10d-S(f)-20W-Generic-z4 from Raditek is a Directional Coupler with Frequency 4 to 40 GHz, Coupling 10 dB, Coupling Variation ±1.2 to ±1.5 dB, Directivity 11 to 15 dB, Average Power 20 W. Tags: Module with Connectors. More details for RCPL-4-40-10d-S(f)-20W-Generic-z4 can be seen below.