The CSDZ-20H-1.9G from Crane Aerospace & Electronics is a Directional Coupler with Frequency 1700 to 2000 MHz, Coupling 20 dB, Coupling Variation ±0.5 dB, Frequency Sensitivity ±0.15 dB, Directivity 20 dB. Tags: Surface Mount. More details for CSDZ-20H-1.9G can be seen below.