The WMC-1-20-20dB-S from Werbel Microwave is a Directional Coupler with Frequency 1 to 20 GHz, Coupling 20 dB, Coupling Variation ±1.2 dB, Frequency Sensitivity ±0.8 to ±1.5 dB, Directivity 10 to 13 dB. Tags: Module with Connectors. More details for WMC-1-20-20dB-S can be seen below.