The DBTC-18-4-75LX+ from Mini Circuits is a Directional Coupler with Frequency 5 MHz to 1 GHz, Coupling 18.08 to 18.68 dB, Directivity 14.66 to 27.35 dB, Power 1 W, Average Power 1 W. Tags: Surface Mount. More details for DBTC-18-4-75LX+ can be seen below.