The WMC-0.5-18.5-20dB-S from Werbel Microwave is a Directional Coupler with Frequency 0.5 to 18.5 GHz, Coupling 20 dB, Coupling Variation ±1.2 dB, Frequency Sensitivity ±0.8 to ±1.5 dB, Directivity 11 to 16 dB. Tags: Module with Connectors. More details for WMC-0.5-18.5-20dB-S can be seen below.