The C1-C29-XX from RD Microwaves is a Directional Coupler with Frequency 6 to 18 GHz, Coupling 6 to 30 dB, Coupling Variation ±1 to 1.25 dB, Frequency Sensitivity ±0.6 to 0.75 dB, Directivity 15 dB. Tags: Module with Connectors. More details for C1-C29-XX can be seen below.