The WMC-2-18-30dB-S from Werbel Microwave is a Directional Coupler with Frequency 2 to 18 GHz, Coupling 30 dB, Coupling Variation ±2.5 dB, Frequency Sensitivity ±0.55 to ±1.5 dB, Directivity 12 to 17 dB. Tags: Module with Connectors. More details for WMC-2-18-30dB-S can be seen below.