The C2-A53 from RD Microwaves is a Directional Coupler with Frequency 8 to 16 GHz, Coupling 20 dB, Coupling Variation ±1.25 dB, Frequency Sensitivity 0.80 dB, Directivity 15 dB. Tags: Module with Connectors. More details for C2-A53 can be seen below.