The DDH 4020100 from Quantic TRM is a Dual Directional Coupler with Coupling 20 to 40 dB, Coupling Variation ± 0.5 dB, Frequency DC to 100 MHz, Average Power 25 W, Insertion Loss 0.2 dB. Tags: Module with Connectors. More details for DDH 4020100 can be seen below.