The 27003 from Narda-MITEQ is a Directional Coupler with Frequency 2 to 18 GHz, Coupling 30 to 50 dB, Coupling Variation ±1.4 dB, Frequency Sensitivity ±1 dB, Directivity 10 to 12 dB. Tags: Module with Connectors. More details for 27003 can be seen below.