The CD3.65-6.45-30-30 from Analog Microwave Design is a Directional Coupler with Frequency 3.65 to 6.45 GHz, Coupling 30 dB, Directivity 20 dB, Average Power 30 W, Peak Power 250 W. Tags: Module with Connectors. More details for CD3.65-6.45-30-30 can be seen below.