The C1-A0518-30 from RD Microwaves is a Directional Coupler with Frequency 500 MHz to 18 GHz, Coupling 30 dB, Coupling Variation ±3 dB, Directivity 9 to 20 dB, Average Power 10 to 50 W. Tags: Module with Connectors. More details for C1-A0518-30 can be seen below.