The CE10-0R640 from Marki Microwave is a Directional Coupler with Frequency 0.6 to 40 GHz, Coupling 9.5 to 10.5 dB, Coupling Variation ±0.8 to ±1.5 dB, Amplitude Flatness ±0.2 to ±0.5 dB, Directivity 15 to 24 dB. Tags: Module with Connectors. More details for CE10-0R640 can be seen below.