The WMC-2-18-20dB-S from Werbel Microwave is a Directional Coupler with Frequency 2 to 18 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.45 to ±1 dB, Directivity 15 to 17 dB. Tags: Module with Connectors. More details for WMC-2-18-20dB-S can be seen below.