The WMC-6-18-30dB-S from Werbel Microwave is a Directional Coupler with Frequency 6 to 18 GHz, Coupling 30 dB, Coupling Variation ±2 dB, Frequency Sensitivity ±0.5 to ±1.5 dB, Directivity 11 to 14 dB. Tags: Module with Connectors. More details for WMC-6-18-30dB-S can be seen below.