The 317.2020-20/S from Microwave Devices Inc. is a Directional Coupler with Frequency 18.5 to 19.5 GHz, Coupling 20±1.25 dB, Coupling Variation ±1.25 dB, Frequency Sensitivity ±0.80 dB, Directivity 10 dB. Tags: Module with Connectors. More details for 317.2020-20/S can be seen below.