The BDC-010040-10 from Atlantic Microwave is a Directional Coupler with Frequency 1 to 4 GHz, Coupling 10 dB, Coupling Variation ± 1 dB, Frequency Sensitivity ±0.7 dB, Directivity 20 dB. Tags: Module with Connectors. More details for BDC-010040-10 can be seen below.