The D20N020400 from Fujian MIcable is a Directional Coupler with Frequency 2 to 40 GHz, Coupling 20 dB, Coupling Variation ±0.7 dB, Amplitude Flatness ±0.9 dB, Directivity 10 to 13 dB. Tags: Module with Connectors. More details for D20N020400 can be seen below.