The BDC1104-20 from Federal Custom Cable is a Directional Coupler with Frequency 1 to 18 GHz, Coupling 20 dB, Coupling Variation +/- 1 dB, Frequency Sensitivity +/- 0.8 dB, Directivity 12 to 15 dB. Tags: Module with Connectors. More details for BDC1104-20 can be seen below.