The C1-B12N-20 from RD Microwaves is a Directional Coupler with Frequency 500 MHz to 18 GHz, Coupling 10 to 30 dB, Coupling Variation ±1 dB, Directivity 15 dB, Average Power 10 to 400 W. Tags: Module with Connectors. More details for C1-B12N-20 can be seen below.