The 251-091-020 from Broadwave Technologies is a Directional Coupler with Frequency 1 to 2 GHz, Coupling 20 dB, Coupling Variation ±1.25 dB, Frequency Sensitivity ± 0.75 dB, Directivity 20 dB. Tags: Module with Connectors. More details for 251-091-020 can be seen below.