The ZGDC20-372HP+ from Mini Circuits is a Directional Coupler with Frequency 300 to 3700 MHz, Coupling 20.5 to 23.5 dB, Coupling Variation ±0.7 to 2 dB, Directivity 14 to 36 dB, Average Power 150 to 250 W. Tags: Module with Connectors. More details for ZGDC20-372HP+ can be seen below.