The CS20-21-435/3 from Pulsar Microwave is a Directional Coupler with Frequency 8 to 20 GHz, Coupling 20 dB, Coupling Variation ±1 dB, Amplitude Flatness 0.8 dB, Directivity 12 dB. Tags: Module with Connectors. More details for CS20-21-435/3 can be seen below.