The CS20-06-435/3 from Pulsar Microwave is a Directional Coupler with Frequency 3.6 to 4.2 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Amplitude Flatness 0.3 dB, Directivity 15 dB. Tags: Module with Connectors. More details for CS20-06-435/3 can be seen below.