The C-1830-20 from Werbel Microwave is a Directional Coupler with Frequency 300 MHz to 8 GHz, Coupling 20 dB, Coupling Variation ±1.5 dB, Directivity 20 to 25 dB, Average Power 20 W. Tags: Module with Connectors. More details for C-1830-20 can be seen below.