The ADC-18-4-75R+ from Mini Circuits is a Directional Coupler with Frequency 20 MHz to 1 GHz, Coupling 17.33 to 17.79 dB, Directivity 13.84 to 43.88 dB, Power 1 W, Average Power 1 W. Tags: Surface Mount. More details for ADC-18-4-75R+ can be seen below.