The ZMDC-20-3+ from Mini Circuits is a Directional Coupler with Frequency 0.2 to 250 MHz, Coupling 19.3 to 19.5 dB, Directivity 33.18 to 51.88 dB, Power 1.5 to 4 W, Average Power 1.5 to 4 W. Tags: Module with Connectors. More details for ZMDC-20-3+ can be seen below.