The C1-B65 from RD Microwaves is a Directional Coupler with Frequency 1 to 22 GHz, Coupling 10 dB, Coupling Variation ±1 dB, Frequency Sensitivity 0.80 dB, Directivity 11 to 15 dB. Tags: Module with Connectors. More details for C1-B65 can be seen below.