The CE20-0R640 from Marki Microwave is a Bi-Directional Coupler with Frequency 600 MHz to 40 GHz, Coupling 19.5 to 20.5 dB, Coupling Variation ±1 to 2 dB, Insertion Loss 0.91 to 1.85 dB, Directivity 15 to 27 dB. Tags: Module with Connectors. More details for CE20-0R640 can be seen below.