The CSDZ-20H-2.1G SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 2000 to 2300 MHz, Coupling 20 dB, Coupling Variation ±0.5 dB, Frequency Sensitivity ±0.1 dB, Directivity 20 dB. Tags: Surface Mount. More details for CSDZ-20H-2.1G SQ can be seen below.