Model WMC-2-18-20dB-S from Werbel Microwave is a directional coupler that covers 2 GHz to 18 GHz with broadband flat coupling response, typically ±0.45dB, high directivity, and excellent return loss performance.  Return loss is 18dB typ.  Directivity 17dB typical.  Higher directivity is available on special order.  Coupling flatness ±0.45dB typical.  Insertion loss 0.8dB typical.  The enclosure is aluminum with threaded mounting holes.  Stainless steel SMA female connectors for rugged, reliability.  RoHS complaint however lead solder is available on special order.  Our unique approach as the design of the coupling segment provides excellent ripple performance, thereby providing highly accurate measurements across the bands.  Such bands include S band, C band, X band and Ku band.  Assembled and tested in the USA.