The 4055-6 from Narda-MITEQ is a Directional Coupler with Frequency 7.5 to 16 GHz, Coupling 6 dB, Coupling Variation ±1.10 dB, Frequency Sensitivity ±0.60 dB, Directivity 12 dB. Tags: Module with Connectors. More details for 4055-6 can be seen below.