The DC4-20S-1.25G from MegaPhase is a Directional Coupler with Frequency 500 MHz to 2 GHz, Coupling 20 dB, Coupling Variation ±0.75 dB, Directivity 23 dB, Average Power 50 W. Tags: Module with Connectors. More details for DC4-20S-1.25G can be seen below.