The 87301D from Keysight Technologies is a Directional Coupler with Frequency 1 to 40 GHz, Coupling 13 dB, Coupling Variation ± 1 dB, Frequency Sensitivity ± 1.2 dB, Directivity 10 to 14 dB. Tags: Module with Connectors. More details for 87301D can be seen below.