The 251-010-020 from Broadwave Technologies is a Directional Coupler with Frequency 2 to 18 GHz, Coupling 20 dB, Coupling Variation ± 1.0 dB, Frequency Sensitivity ± 0.5 dB, Directivity 12 dB. Tags: Module with Connectors. More details for 251-010-020 can be seen below.