The MC0640-20 from Fairview Microwave is a Directional Coupler with Frequency 6 to 40 GHz, Coupling 20 dB, Coupling Variation ±1.5 dB, Frequency Sensitivity 1.5 dB, Directivity 10 dB. Tags: Module with Connectors. More details for MC0640-20 can be seen below.