The ZGDC30-372HP+ from Mini Circuits is a Directional Coupler with Frequency 300 to 3700 MHz, Coupling 30 to 31.5 dB, Coupling Variation ±0.7 to 2 dB, Directivity 12 to 30 dB, Average Power 150 to 250 W. Tags: Module with Connectors. More details for ZGDC30-372HP+ can be seen below.