The 4227-16 from Narda-MITEQ is a Directional Coupler with Frequency 1.7 to 26.5 GHz, Coupling 16 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±1.0 dB, Directivity 12 to 15 dB. Tags: Module with Connectors. More details for 4227-16 can be seen below.