DC-2018-050-10SF is a directional coupler that covers 2 to 18 GHz with broadband flat coupling response, high directivity, and excellent return loss performance. Frequency sensitivity, or coupling flatness, is very good, with ±0.3dB typical. The aluminum enclosure measures 2.25 x 0.73 x 0.50 inches with threaded mounting holes. Coupling flatness ±0.35dB typical. Insertion loss 0.8dB typical. Directivity 17B typical. Higher directivity is available on special order. Return loss 19dB typical. SMA Female connectors. The device is RoHS complaint, but Sn/Pb solder is available for military applications on special build to order. The device covers the letter bands S, C, X and Ku band all in one enclosure. Our own unique coupling design allows for excellent flatness, thereby increasing measurement accuracy. Designed, assembled and tested in the USA.