The Z30-18-4-75+ from Mini Circuits is a Directional Coupler with Frequency 5 MHz to 1 GHz, Coupling 18.05 to 18.84 dB, Directivity 16.02 to 28.42 dB, Power 1 W, Average Power 1 W. Tags: Module with Connectors. More details for Z30-18-4-75+ can be seen below.