Model WMC-2-18-10dB-S from Werbel Microwave 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.