The D30N180400 from Fujian MIcable is a Directional Coupler with Frequency 18 to 40 GHz, Coupling 30 dB, Coupling Variation ±0.6 dB, Amplitude Flatness ±0.7 dB, Directivity 10 dB. Tags: Module with Connectors. More details for D30N180400 can be seen below.