The MM-BDC-010400-20 from Mountain Microwave Technology is a Directional Coupler with Frequency 1 to 40 GHz, Coupling 20 dB, Coupling Variation ±1.2 dB, Directivity 10 dB, Average Power 20 W. Tags: Module with Connectors. More details for MM-BDC-010400-20 can be seen below.