The C3-20-30-6000-S from I.F. Engineering is a Directional Coupler with Frequency 30 MHz to 6 GHz, Coupling 20 dB, Coupling Variation ±1.5 dB, Directivity 20 dB, Average Power 1 W. Tags: Module with Connectors. More details for C3-20-30-6000-S can be seen below.