The CSDZ-10Z-2.1G from Crane Aerospace & Electronics is a Directional Coupler with Frequency 2000 to 2300 MHz, Coupling 10 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±0.3 dB, Directivity 17 dB. Tags: Surface Mount. More details for CSDZ-10Z-2.1G can be seen below.