The CS20-51-435/4 from Pulsar Microwave is a Directional Coupler with Frequency 6 to 40 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Amplitude Flatness 1 dB, Directivity 10 dB. Tags: Module with Connectors. More details for CS20-51-435/4 can be seen below.