The C1-A98 from RD Microwaves is a Directional Coupler with Frequency 1 to 18 GHz, Coupling 16 dB, Coupling Variation ±1 dB, Frequency Sensitivity 0.5 dB, Directivity 12 to 15 dB. Tags: Module with Connectors. More details for C1-A98 can be seen below.