The CE10-1R540 from Marki Microwave is a Directional Coupler with Frequency 1.5 to 40 GHz, Coupling 9.5 to 10.5 dB, Coupling Variation ±0.85 to ±1.7 dB, Amplitude Flatness ±0.25 to ±0.5 dB, Directivity 15 to 26 dB. Tags: Module with Connectors. More details for CE10-1R540 can be seen below.