The LDDC-0.5/18-20S from Leader-MW is a Dual Directional Coupler with Coupling 20 dB, Coupling Variation ±1 dB, Frequency 0.5 to 18 GHz, Average Power 20 W, Insertion Loss 3.3 dB. Tags: Module with Connectors. More details for LDDC-0.5/18-20S can be seen below.