The CE10-1R540 from Marki Microwave is a Bi-Directional Coupler with Frequency 1.5 to 40 GHz, Coupling 9.5 to 10.5 dB, Coupling Variation ±0.85 to 1.7 dB, Insertion Loss 0.42 to 1.7 dB, Directivity 15 to 24 dB. Tags: Module with Connectors. More details for CE10-1R540 can be seen below.