The 251-087-020 from Broadwave Technologies is a Directional Coupler with Frequency 12.4 to 18 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ± 0.75 dB, Directivity 12 dB. Tags: Module with Connectors. More details for 251-087-020 can be seen below.