The MM-DDC-010400-20 from Mountain Microwave Technology is a Dual Directional Coupler with Coupling 20 dB, Frequency 1 to 40 GHz, Average Power 30 W, Insertion Loss 2.2 dB, Directivity 12 dB. Tags: Module with Connectors. More details for MM-DDC-010400-20 can be seen below.