The CSDZ-10SH-2.1G from Crane Aerospace & Electronics is a Directional Coupler with Frequency 1900 to 2300 MHz, Coupling 10 dB, Coupling Variation ±0.5 dB, Frequency Sensitivity ±0.10 dB, Directivity 22 dB. Tags: Surface Mount. More details for CSDZ-10SH-2.1G can be seen below.