The CS20-05-436/11N from Pulsar Microwave is a Directional Coupler with Frequency 2 to 4 GHz, Coupling 20 dB, Coupling Variation ±1.25 dB, Amplitude Flatness 0.75 dB, Directivity 18 dB. Tags: Module with Connectors. More details for CS20-05-436/11N can be seen below.