The ZGDC20-33HP+ from Mini Circuits is a Directional Coupler with Frequency 300 MHz to 3 GHz, Coupling 20 to 22 dB, Directivity 15 to 28 dB, Power 160 to 250 W, Average Power 160 to 250 W. Tags: Module with Connectors. More details for ZGDC20-33HP+ can be seen below.