The DBTC-20-4-75+ from Mini Circuits is a Directional Coupler with Frequency 5 MHz to 1.25 GHz, Coupling 19.98 to 20.53 dB, Directivity 8.81 to 21.31 dB, Power 0.5 to 1 W, Average Power 0.5 to 1 W. Tags: Surface Mount. More details for DBTC-20-4-75+ can be seen below.