The 317.2028-30/S from Microwave Devices Inc. is a Directional Coupler with Frequency 12.4 to 18 GHz, Coupling 30±1.00 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.50 dB, Directivity 15 dB. Tags: Module with Connectors. More details for 317.2028-30/S can be seen below.