The RCPL-18-40-10-20d-2.4(3)-1W-z4 from Raditek is a Directional Coupler with Frequency 18 to 40 GHz, Coupling 10 to 20 dB, Coupling Variation ±1.5 dB, Directivity 11 dB, Average Power 1 W. Tags: Module with Connectors. More details for RCPL-18-40-10-20d-2.4(3)-1W-z4 can be seen below.